VIA Integration Graphic Chip Console Framebuffer Driver¶

Platform¶

The console framebuffer driver is for graphics chips of VIA UniChrome Family (CLE266, PM800 / CN400 / CN300, P4M800CE / P4M800Pro / CN700 / VN800, CX700 / VX700, K8M890, P4M890, CN896 / P4M900, VX800, VX855)

Driver features¶

Device: CRT, LCD, DVI

Support viafb_mode:

CRT:
    640x480(60, 75, 85, 100, 120 Hz), 720x480(60 Hz),
    720x576(60 Hz), 800x600(60, 75, 85, 100, 120 Hz),
    848x480(60 Hz), 856x480(60 Hz), 1024x512(60 Hz),
    1024x768(60, 75, 85, 100 Hz), 1152x864(75 Hz),
    1280x768(60 Hz), 1280x960(60 Hz), 1280x1024(60, 75, 85 Hz),
    1440x1050(60 Hz), 1600x1200(60, 75 Hz), 1280x720(60 Hz),
    1920x1080(60 Hz), 1400x1050(60 Hz), 800x480(60 Hz)

color depth: 8 bpp, 16 bpp, 32 bpp supports.

Support 2D hardware accelerator.

Using the viafb module¶

Start viafb with default settings:
#modprobe viafb
Start viafb with user options:
#modprobe viafb viafb_mode=800x600 viafb_bpp=16 viafb_refresh=60
          viafb_active_dev=CRT+DVI viafb_dvi_port=DVP1
          viafb_mode1=1024x768 viafb_bpp=16 viafb_refresh1=60
          viafb_SAMM_ON=1
viafb_mode:

640x480 (default)

720x480

800x600

1024x768

viafb_bpp:

8, 16, 32 (default:32)

viafb_refresh:

60, 75, 85, 100, 120 (default:60)

viafb_lcd_dsp_method:

0 : expansion (default)

1 : centering

viafb_lcd_mode:
0 : LCD panel with LSB data format input (default) 1 : LCD panel with MSB data format input

viafb_lcd_panel_id:

0 : Resolution: 640x480, Channel: single, Dithering: Enable

1 : Resolution: 800x600, Channel: single, Dithering: Enable

2 : Resolution: 1024x768, Channel: single, Dithering: Enable (default)

3 : Resolution: 1280x768, Channel: single, Dithering: Enable

4 : Resolution: 1280x1024, Channel: dual, Dithering: Enable

5 : Resolution: 1400x1050, Channel: dual, Dithering: Enable

6 : Resolution: 1600x1200, Channel: dual, Dithering: Enable

8 : Resolution: 800x480, Channel: single, Dithering: Enable

9 : Resolution: 1024x768, Channel: dual, Dithering: Enable

10: Resolution: 1024x768, Channel: single, Dithering: Disable

11: Resolution: 1024x768, Channel: dual, Dithering: Disable

12: Resolution: 1280x768, Channel: single, Dithering: Disable

13: Resolution: 1280x1024, Channel: dual, Dithering: Disable

14: Resolution: 1400x1050, Channel: dual, Dithering: Disable

15: Resolution: 1600x1200, Channel: dual, Dithering: Disable

16: Resolution: 1366x768, Channel: single, Dithering: Disable

17: Resolution: 1024x600, Channel: single, Dithering: Enable

18: Resolution: 1280x768, Channel: dual, Dithering: Enable

19: Resolution: 1280x800, Channel: single, Dithering: Enable

viafb_accel:

0 : No 2D Hardware Acceleration

1 : 2D Hardware Acceleration (default)

viafb_SAMM_ON:

0 : viafb_SAMM_ON disable (default)

1 : viafb_SAMM_ON enable

viafb_mode1: (secondary display device)

640x480 (default)

720x480

800x600

1024x768

viafb_bpp1: (secondary display device)

8, 16, 32 (default:32)

viafb_refresh1: (secondary display device)

60, 75, 85, 100, 120 (default:60)

viafb_active_dev:
This option is used to specify active devices.(CRT, DVI, CRT+LCD...) DVI stands for DVI or HDMI, E.g., If you want to enable HDMI, set viafb_active_dev=DVI. In SAMM case, the previous of viafb_active_dev is primary device, and the following is secondary device.

For example:

To enable one device, such as DVI only, we can use:
modprobe viafb viafb_active_dev=DVI
To enable two devices, such as CRT+DVI:
modprobe viafb viafb_active_dev=CRT+DVI;
For DuoView case, we can use:
modprobe viafb viafb_active_dev=CRT+DVI
OR:
modprobe viafb viafb_active_dev=DVI+CRT...
For SAMM case:

If CRT is primary and DVI is secondary, we should use:
modprobe viafb viafb_active_dev=CRT+DVI viafb_SAMM_ON=1...
If DVI is primary and CRT is secondary, we should use:
modprobe viafb viafb_active_dev=DVI+CRT viafb_SAMM_ON=1...
viafb_display_hardware_layout:
This option is used to specify display hardware layout for CX700 chip.

1 : LCD only

2 : DVI only

3 : LCD+DVI (default)

4 : LCD1+LCD2 (internal + internal)

16: LCD1+ExternalLCD2 (internal + external)

viafb_second_size:
This option is used to set second device memory size(MB) in SAMM case. The minimal size is 16.

viafb_platform_epia_dvi:
This option is used to enable DVI on EPIA - M

0 : No DVI on EPIA - M (default)

1 : DVI on EPIA - M

viafb_bus_width:
When using 24 - Bit Bus Width Digital Interface, this option should be set.

12: 12-Bit LVDS or 12-Bit TMDS (default)

24: 24-Bit LVDS or 24-Bit TMDS

viafb_device_lcd_dualedge:
When using Dual Edge Panel, this option should be set.

0 : No Dual Edge Panel (default)

1 : Dual Edge Panel

viafb_lcd_port:
This option is used to specify LCD output port, available values are "DVP0" "DVP1" "DFP_HIGHLOW" "DFP_HIGH" "DFP_LOW".

for external LCD + external DVI on CX700(External LCD is on DVP0), we should use:
modprobe viafb viafb_lcd_port=DVP0...

Notes:

CRT may not display properly for DuoView CRT & DVI display at the "640x480" PAL mode with DVI overscan enabled.
SAMM stands for single adapter multi monitors. It is different from multi-head since SAMM support multi monitor at driver layers, thus fbcon layer doesn't even know about it; SAMM's second screen doesn't have a device node file, thus a user mode application can't access it directly. When SAMM is enabled, viafb_mode and viafb_mode1, viafb_bpp and viafb_bpp1, viafb_refresh and viafb_refresh1 can be different.
When console is depending on viafbinfo1, dynamically change resolution and bpp, need to call VIAFB specified ioctl interface VIAFB_SET_DEVICE instead of calling common ioctl function FBIOPUT_VSCREENINFO since viafb doesn't support multi-head well, or it will cause screen crush.

Configure viafb with "fbset" tool¶

"fbset" is an inbox utility of Linux.
Inquire current viafb information, type:
# fbset -i
Set various resolutions and viafb_refresh rates:
# fbset <resolution-vertical_sync>
example:
# fbset "1024x768-75"
or:
# fbset -g 1024 768 1024 768 32
Check the file "/etc/fb.modes" to find display modes available.
Set the color depth:
# fbset -depth <value>
example:
# fbset -depth 16

Configure viafb via /proc¶

The following files exist in /proc/viafb
supported_output_devices
This read-only file contains a full ',' separated list containing all output devices that could be available on your platform. It is likely that not all of those have a connector on your hardware but it should provide a good starting point to figure out which of those names match a real connector.

Example:
# cat /proc/viafb/supported_output_devices
iga1/output_devices, iga2/output_devices
These two files are readable and writable. iga1 and iga2 are the two independent units that produce the screen image. Those images can be forwarded to one or more output devices. Reading those files is a way to query which output devices are currently used by an iga.

Example:
# cat /proc/viafb/iga1/output_devices
If there are no output devices printed the output of this iga is lost. This can happen for example if only one (the other) iga is used. Writing to these files allows adjusting the output devices during runtime. One can add new devices, remove existing ones or switch between igas. Essentially you can write a ',' separated list of device names (or a single one) in the same format as the output to those files. You can add a '+' or '-' as a prefix allowing simple addition and removal of devices. So a prefix '+' adds the devices from your list to the already existing ones, '-' removes the listed devices from the existing ones and if no prefix is given it replaces all existing ones with the listed ones. If you remove devices they are expected to turn off. If you add devices that are already part of the other iga they are removed there and added to the new one.

Examples:

Add CRT as output device to iga1:
# echo +CRT > /proc/viafb/iga1/output_devices
Remove (turn off) DVP1 and LVDS1 as output devices of iga2:
# echo -DVP1,LVDS1 > /proc/viafb/iga2/output_devices
Replace all iga1 output devices by CRT:
# echo CRT > /proc/viafb/iga1/output_devices

Bootup with viafb¶

Add the following line to your grub.conf:

append = "video=viafb:viafb_mode=1024x768,viafb_bpp=32,viafb_refresh=85"

VIA Framebuffer modes¶

#
#
#   These data are based on the CRTC parameters in
#
#       VIA Integration Graphics Chip
#       (C) 2004 VIA Technologies Inc.
#

#
#   640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      640     480
#   Scan Frequency      31.469 kHz  59.94 Hz
#   Sync Width      3.813 us    0.064 ms
#               12 chars    2 lines
#   Front Porch     0.636 us    0.318  ms
#               2 chars     10 lines
#   Back Porch      1.907 us    1.048  ms
#               6 chars     33 lines
#   Active Time     25.422 us   15.253 ms
#               80 chars    480 lines
#   Blank Time      6.356 us    1.430 ms
#               20 chars    45 lines
#   Polarity        negative    negative
#

mode "640x480-60"
# D: 25.175 MHz, H: 31.469 kHz, V: 59.94 Hz
    geometry 640 480 640 480 32
    timings 39722 48 16 33 10 96 2 endmode mode "480x640-60"
# D: 24.823 MHz, H: 39.780 kHz, V: 60.00 Hz
    geometry 480 640 480 640 32 timings 39722 72 24 19 1 48 3 endmode
#
#   640x480, 75 Hz, Non-Interlaced (31.50 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      640     480
#   Scan Frequency      37.500 kHz  75.00 Hz
#   Sync Width      2.032 us    0.080 ms
#               8 chars     3 lines
#   Front Porch     0.508 us    0.027 ms
#               2 chars     1 lines
#   Back Porch      3.810 us    0.427 ms
#               15 chars    16 lines
#   Active Time     20.317 us   12.800 ms
#               80 chars    480 lines
#   Blank Time      6.349 us    0.533 ms
#               25 chars    20 lines
#   Polarity        negative    negative
#
    mode "640x480-75"
# D: 31.50 MHz, H: 37.500 kHz, V: 75.00 Hz
    geometry 640 480 640 480 32 timings 31747 120 16 16 1 64 3 endmode
#
#   640x480, 85 Hz, Non-Interlaced (36.000 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      640     480
#   Scan Frequency  43.269 kHz  85.00 Hz
#   Sync Width      1.556 us    0.069 ms
#               7 chars     3 lines
#   Front Porch     1.556 us    0.023 ms
#               7 chars     1 lines
#   Back Porch      2.222 us    0.578 ms
#               10 chars    25 lines
#   Active Time     17.778 us   11.093 ms
#               80 chars    480 lines
#   Blank Time      5.333 us    0.670 ms
#               24 chars    29 lines
#   Polarity        negative    negative
#
    mode "640x480-85"
# D: 36.000 MHz, H: 43.269 kHz, V: 85.00 Hz
    geometry 640 480 640 480 32 timings 27777 80 56 25 1 56 3 endmode
#
#   640x480, 100 Hz, Non-Interlaced (43.163 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      640     480
#   Scan Frequency      50.900 kHz  100.00 Hz
#   Sync Width      1.483 us    0.058 ms
#               8 chars     3 lines
#   Front Porch     0.927 us    0.019 ms
#               5 chars     1 lines
#   Back Porch      2.409 us    0.475 ms
#               13 chars    25 lines
#   Active Time     14.827 us   9.430 ms
#               80 chars    480 lines
#   Blank Time      4.819 us    0.570 ms
#               26 chars    29 lines
#   Polarity        positive    positive
#
    mode "640x480-100"
# D: 43.163 MHz, H: 50.900 kHz, V: 100.00 Hz
    geometry 640 480 640 480 32 timings 23168 104 40 25 1 64 3 endmode
#
#   640x480, 120 Hz, Non-Interlaced (52.406 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      640     480
#   Scan Frequency      61.800 kHz  120.00 Hz
#   Sync Width      1.221 us    0.048 ms
#               8 chars         3 lines
#   Front Porch     0.763 us    0.016 ms
#               5 chars     1 lines
#   Back Porch      1.984 us    0.496 ms
#               13 chars    31 lines
#   Active Time     12.212 us   7.767 ms
#               80 chars    480 lines
#   Blank Time      3.969 us    0.566 ms
#               26 chars    35 lines
#   Polarity        positive    positive
#
    mode "640x480-120"
# D: 52.406 MHz, H: 61.800 kHz, V: 120.00 Hz
    geometry 640 480 640 480 32 timings 19081 104 40 31 1 64 3 endmode
#
#   720x480, 60 Hz, Non-Interlaced (26.880 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      720     480
#   Scan Frequency      30.000 kHz  60.241 Hz
#   Sync Width      2.679 us    0.099 ms
#               9 chars     3 lines
#   Front Porch     0.595 us    0.033 ms
#               2 chars     1 lines
#   Back Porch      3.274 us    0.462 ms
#               11 chars    14 lines
#   Active Time     26.786 us   16.000 ms
#               90 chars    480 lines
#   Blank Time      6.548 us    0.600 ms
#               22 chars    18 lines
#   Polarity        positive    positive
#
    mode "720x480-60"
# D: 26.880 MHz, H: 30.000 kHz, V: 60.24 Hz
    geometry 720 480 720 480 32 timings 37202 88 16 14 1 72 3 endmode
#
#   800x480, 60 Hz, Non-Interlaced (29.581 MHz dotclock)
#
#               Horizontal    Vertical
#   Resolution      800         480
#   Scan Frequency  29.892 kHz  60.00 Hz
#   Sync Width      2.704 us    100.604 us
#                   10 chars    3 lines
#   Front Porch     0.541 us    33.535 us
#                   2 chars     1 lines
#   Back Porch      3.245 us    435.949 us
#                   12 chars    13 lines
#   Active Time     27.044 us   16.097 ms
#                   100 chars   480 lines
#   Blank Time      6.491 us    0.570 ms
#                   24 chars    17 lines
#   Polarity        positive    positive
#
    mode "800x480-60"
# D: 29.500 MHz, H: 29.738 kHz, V: 60.00 Hz
    geometry 800 480 800 480 32 timings 33805 96 24 10 3 72 7 endmode
#
#   720x576, 60 Hz, Non-Interlaced (32.668 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      720     576
#   Scan Frequency      35.820 kHz  60.00 Hz
#   Sync Width      2.204 us    0.083 ms
#               9 chars     3 lines
#   Front Porch     0.735 us    0.027 ms
#               3 chars     1 lines
#   Back Porch      2.939 us    0.459 ms
#               12 chars    17 lines
#   Active Time     22.040 us   16.080 ms
#               90 chars    476 lines
#   Blank Time      5.877 us    0.586 ms
#               24 chars    21 lines
#   Polarity        positive    positive
#
    mode "720x576-60"
# D: 32.668 MHz, H: 35.820 kHz, V: 60.00 Hz
    geometry 720 576 720 576 32 timings 30611 96 24 17 1 72 3 endmode
#
#   800x600, 60 Hz, Non-Interlaced (40.00 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      800     600
#   Scan Frequency      37.879 kHz  60.32 Hz
#   Sync Width      3.200 us    0.106 ms
#               16 chars    4 lines
#   Front Porch     1.000 us    0.026 ms
#               5 chars     1 lines
#   Back Porch      2.200 us    0.607 ms
#               11 chars    23 lines
#   Active Time     20.000 us   15.840 ms
#               100 chars   600 lines
#   Blank Time      6.400 us    0.739 ms
#               32 chars    28 lines
#   Polarity        positive    positive
#
    mode "800x600-60"
# D: 40.00 MHz, H: 37.879 kHz, V: 60.32 Hz
    geometry 800 600 800 600 32
    timings 25000 88 40 23 1 128 4 hsync high vsync high endmode
#
#   800x600, 75 Hz, Non-Interlaced (49.50 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      800     600
#   Scan Frequency      46.875 kHz  75.00 Hz
#   Sync Width      1.616 us    0.064 ms
#               10 chars    3 lines
#   Front Porch     0.323 us    0.021 ms
#               2 chars     1 lines
#   Back Porch      3.232 us    0.448 ms
#               20 chars    21 lines
#   Active Time     16.162 us   12.800 ms
#               100 chars   600 lines
#   Blank Time      5.172 us    0.533 ms
#               32 chars    25 lines
#   Polarity        positive    positive
#
    mode "800x600-75"
# D: 49.50 MHz, H: 46.875 kHz, V: 75.00 Hz
    geometry 800 600 800 600 32
    timings 20203 160 16 21 1 80 3 hsync high vsync high endmode
#
#   800x600, 85 Hz, Non-Interlaced (56.25 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      800     600
#   Scan Frequency      53.674 kHz  85.061 Hz
#   Sync Width      1.138 us    0.056 ms
#               8 chars     3 lines
#   Front Porch     0.569 us    0.019 ms
#               4 chars     1 lines
#   Back Porch      2.702 us    0.503 ms
#               19 chars    27 lines
#   Active Time     14.222 us   11.179 ms
#               100 chars   600 lines
#   Blank Time      4.409 us    0.578 ms
#               31 chars    31 lines
#   Polarity        positive    positive
#
    mode "800x600-85"
# D: 56.25 MHz, H: 53.674 kHz, V: 85.061 Hz
    geometry 800 600 800 600 32
    timings 17777 152 32 27 1 64 3 hsync high vsync high endmode
#
#   800x600, 100 Hz, Non-Interlaced (67.50 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      800     600
#   Scan Frequency      62.500 kHz  100.00 Hz
#   Sync Width      0.948 us    0.064 ms
#               8 chars     4 lines
#   Front Porch     0.000 us    0.112 ms
#               0 chars     7 lines
#   Back Porch      3.200 us    0.224 ms
#               27 chars    14 lines
#   Active Time     11.852 us   9.600 ms
#               100 chars   600 lines
#   Blank Time      4.148 us    0.400 ms
#               35 chars    25 lines
#   Polarity        positive    positive
#
    mode "800x600-100"
# D: 67.50 MHz, H: 62.500 kHz, V: 100.00 Hz
    geometry 800 600 800 600 32
    timings 14667 216 0 14 7 64 4 hsync high vsync high endmode
#
#   800x600, 120 Hz, Non-Interlaced (83.950 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      800     600
#   Scan Frequency  77.160 kHz  120.00 Hz
#   Sync Width      1.048 us    0.039 ms
#               11 chars    3 lines
#   Front Porch     0.667 us    0.013 ms
#               7 chars     1 lines
#   Back Porch      1.715 us    0.507 ms
#               18 chars    39 lines
#   Active Time     9.529 us    7.776 ms
#               100 chars   600 lines
#   Blank Time      3.431 us    0.557 ms
#               36 chars    43 lines
#   Polarity        positive    positive
#
    mode "800x600-120"
# D: 83.950 MHz, H: 77.160 kHz, V: 120.00 Hz
    geometry 800 600 800 600 32
    timings 11912 144 56 39 1 88 3 hsync high vsync high endmode
#
#   848x480, 60 Hz, Non-Interlaced (31.490 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      848     480
#   Scan Frequency  29.820 kHz  60.00 Hz
#   Sync Width      2.795 us    0.099 ms
#               11 chars    3 lines
#   Front Porch     0.508 us    0.033 ms
#               2 chars     1 lines
#   Back Porch      3.303 us    0.429 ms
#               13 chars    13 lines
#   Active Time     26.929 us   16.097 ms
#               106 chars   480 lines
#   Blank Time      6.605 us    0.570 ms
#               26 chars    17 lines
#   Polarity        positive    positive
#
    mode "848x480-60"
# D: 31.500 MHz, H: 29.830 kHz, V: 60.00 Hz
    geometry 848 480 848 480 32
    timings 31746 104 24 12 3 80 5 hsync high vsync high endmode
#
#   856x480, 60 Hz, Non-Interlaced (31.728 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      856     480
#   Scan Frequency  29.820 kHz  60.00 Hz
#   Sync Width      2.774 us    0.099 ms
#               11 chars    3 lines
#   Front Porch     0.504 us    0.033 ms
#               2 chars     1 lines
#   Back Porch      3.728 us    0.429 ms
#               13 chars    13 lines
#   Active Time     26.979 us   16.097 ms
#               107 chars   480 lines
#   Blank Time      6.556 us    0.570 ms
#               26 chars    17 lines
#   Polarity        positive    positive
#
    mode "856x480-60"
# D: 31.728 MHz, H: 29.820 kHz, V: 60.00 Hz
    geometry 856 480 856 480 32
    timings 31518 104 16 13 1 88 3
    hsync high vsync high endmode mode "960x600-60"
# D: 45.250 MHz, H: 37.212 kHz, V: 60.00 Hz
    geometry 960 600 960 600 32 timings 22099 128 32 15 3 96 6 endmode
#
#   1000x600, 60 Hz, Non-Interlaced (48.068 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1000     600
#   Scan Frequency  37.320 kHz  60.00 Hz
#   Sync Width      2.164 us    0.080 ms
#               13 chars    3 lines
#   Front Porch     0.832 us    0.027 ms
#               5 chars     1 lines
#   Back Porch      2.996 us    0.483 ms
#               18 chars    18 lines
#   Active Time     20.804 us   16.077 ms
#               125 chars   600 lines
#   Blank Time      5.991 us    0.589 ms
#               36 chars    22 lines
#   Polarity        negative    positive
#
    mode "1000x600-60"
# D: 48.068 MHz, H: 37.320 kHz, V: 60.00 Hz
    geometry 1000 600 1000 600 32
    timings 20834 144 40 18 1 104 3 endmode mode "1024x576-60"
# D: 46.996 MHz, H: 35.820 kHz, V: 60.00 Hz
    geometry 1024 576 1024 576 32
    timings 21278 144 40 17 1 104 3 endmode mode "1024x600-60"
# D: 48.964 MHz, H: 37.320 kHz, V: 60.00 Hz
    geometry 1024 600 1024 600 32
    timings 20461 144 40 18 1 104 3 endmode mode "1088x612-60"
# D: 52.952 MHz, H: 38.040 kHz, V: 60.00 Hz
    geometry 1088 612 1088 612 32 timings 18877 152 48 16 3 104 5 endmode
#
#   1024x512, 60 Hz, Non-Interlaced (41.291 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1024    512
#   Scan Frequency  31.860 kHz  60.00 Hz
#   Sync Width      2.519 us    0.094 ms
#               13 chars    3 lines
#   Front Porch     0.775 us    0.031 ms
#               4 chars     1 lines
#   Back Porch      3.294 us    0.465 ms
#               17 chars    15 lines
#   Active Time     24.800 us   16.070 ms
#               128 chars   512 lines
#   Blank Time      6.587 us    0.596 ms
#               34 chars    19 lines
#   Polarity        positive    positive
#
    mode "1024x512-60"
# D: 41.291 MHz, H: 31.860 kHz, V: 60.00 Hz
    geometry 1024 512 1024 512 32
    timings 24218 126 32 15 1 104 3 hsync high vsync high endmode
#
#   1024x600, 60 Hz, Non-Interlaced (48.875 MHz dotclock)
#
#                     Horizontal  Vertical
#   Resolution          1024        768
#   Scan Frequency      37.252 kHz  60.00 Hz
#   Sync Width          2.128 us    80.532us
#                       13 chars    3 lines
#   Front Porch        0.818 us     26.844 us
#                       5 chars     1 lines
#   Back Porch          2.946 us    483.192 us
#                       18 chars    18 lines
#   Active Time         20.951 us   16.697 ms
#                       128 chars   622 lines
#   Blank Time          5.893 us    0.591 ms
#                       36 chars    22 lines
#   Polarity            negative    positive
#
#mode "1024x600-60"
#     # D: 48.875 MHz, H: 37.252 kHz, V: 60.00 Hz
#     geometry 1024 600 1024 600 32
#    timings 20460  144 40 18 1 104  3
# endmode
#
#   1024x768, 60 Hz, Non-Interlaced (65.00 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1024        768
#   Scan Frequency      48.363 kHz  60.00 Hz
#   Sync Width      2.092 us    0.124 ms
#               17 chars    6 lines
#   Front Porch     0.369 us    0.062 ms
#               3 chars     3 lines
#   Back Porch      2.462 us    0.601 ms
#               20 chars    29 lines
#   Active Time     15.754 us   15.880 ms
#               128 chars   768 lines
#   Blank Time      4.923 us    0.786 ms
#               40 chars    38 lines
#   Polarity        negative    negative
#
    mode "1024x768-60"
# D: 65.00 MHz, H: 48.363 kHz, V: 60.00 Hz
    geometry 1024 768 1024 768 32 timings 15385 160 24 29 3 136 6 endmode
#
#   1024x768, 75 Hz, Non-Interlaced (78.75 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1024        768
#   Scan Frequency      60.023 kHz  75.03 Hz
#   Sync Width      1.219 us    0.050 ms
#               12 chars    3 lines
#   Front Porch     0.203 us    0.017 ms
#               2 chars     1 lines
#   Back Porch      2.235 us    0.466 ms
#               22 chars    28 lines
#   Active Time     13.003 us   12.795 ms
#               128 chars   768 lines
#   Blank Time      3.657 us    0.533 ms
#               36 chars    32 lines
#   Polarity        positive    positive
#
    mode "1024x768-75"
# D: 78.75 MHz, H: 60.023 kHz, V: 75.03 Hz
    geometry 1024 768 1024 768 32
    timings 12699 176 16 28 1 96 3 hsync high vsync high endmode
#
#   1024x768, 85 Hz, Non-Interlaced (94.50 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1024        768
#   Scan Frequency  68.677 kHz  85.00 Hz
#   Sync Width      1.016 us    0.044 ms
#               12 chars    3 lines
#   Front Porch     0.508 us    0.015 ms
#               6 chars     1 lines
#   Back Porch      2.201 us    0.524 ms
#               26 chars    36 lines
#   Active Time     10.836 us   11.183 ms
#               128 chars   768 lines
#   Blank Time      3.725 us    0.582 ms
#               44 chars    40 lines
#   Polarity        positive    positive
#
    mode "1024x768-85"
# D: 94.50 MHz, H: 68.677 kHz, V: 85.00 Hz
    geometry 1024 768 1024 768 32
    timings 10582 208 48 36 1 96 3 hsync high vsync high endmode
#
#   1024x768, 100 Hz, Non-Interlaced (110.0 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1024        768
#   Scan Frequency      79.023 kHz  99.78 Hz
#   Sync Width      0.800 us    0.101 ms
#               11 chars    8 lines
#   Front Porch     0.000 us    0.000 ms
#               0 chars     0 lines
#   Back Porch      2.545 us    0.202 ms
#               35 chars    16 lines
#   Active Time     9.309 us    9.719 ms
#               128 chars   768 lines
#   Blank Time      3.345 us    0.304 ms
#               46 chars    24 lines
#   Polarity        negative    negative
#
    mode "1024x768-100"
# D: 113.3 MHz, H: 79.023 kHz, V: 99.78 Hz
    geometry 1024 768 1024 768 32
    timings 8825 280 0 16 0 88 8 endmode mode "1152x720-60"
# D: 66.750 MHz, H: 44.859 kHz, V: 60.00 Hz
    geometry 1152 720 1152 720 32 timings 14981 168 56 19 3 112 6 endmode
#
#   1152x864, 75 Hz, Non-Interlaced (110.0 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1152        864
#   Scan Frequency      75.137 kHz  74.99 Hz
#   Sync Width      1.309 us    0.106 ms
#               18 chars    8 lines
#   Front Porch     0.245 us    0.599 ms
#               3 chars     45 lines
#   Back Porch      1.282 us    1.132 ms
#               18 chars    85 lines
#   Active Time     10.473 us   11.499 ms
#               144 chars   864 lines
#   Blank Time      2.836 us    1.837 ms
#               39 chars    138 lines
#   Polarity        positive    positive
#
    mode "1152x864-75"
# D: 110.0 MHz, H: 75.137 kHz, V: 74.99 Hz
    geometry 1152 864 1152 864 32
    timings 9259 144 24 85 45 144 8
    hsync high vsync high endmode mode "1200x720-60"
# D: 70.184 MHz, H: 44.760 kHz, V: 60.00 Hz
    geometry 1200 720 1200 720 32
    timings 14253 184 28 22 1 128 3 endmode mode "1280x600-60"
# D: 61.503 MHz, H: 37.320 kHz, V: 60.00 Hz
    geometry 1280 600 1280 600 32
    timings 16260 184 28 18 1 128 3 endmode mode "1280x720-50"
# D: 60.466 MHz, H: 37.050 kHz, V: 50.00 Hz
    geometry 1280 720 1280 720 32
    timings 16538 176 48 17 1 128 3 endmode mode "1280x768-50"
# D: 65.178 MHz, H: 39.550 kHz, V: 50.00 Hz
    geometry 1280 768 1280 768 32 timings 15342 184 28 19 1 128 3 endmode
#
#   1280x768, 60 Hz, Non-Interlaced (80.136 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1280    768
#   Scan Frequency  47.700 kHz  60.00 Hz
#   Sync Width      1.697 us    0.063 ms
#               17 chars    3 lines
#   Front Porch     0.799 us    0.021 ms
#               8 chars     1 lines
#   Back Porch      2.496 us    0.483 ms
#               25 chars    23 lines
#   Active Time     15.973 us   16.101 ms
#               160 chars   768 lines
#   Blank Time      4.992 us    0.566 ms
#               50 chars    27 lines
#   Polarity        positive    positive
#
    mode "1280x768-60"
# D: 80.13 MHz, H: 47.700 kHz, V: 60.00 Hz
    geometry 1280 768 1280 768 32
    timings 12480 200 48 23 1 126 3 hsync high vsync high endmode
#
#   1280x800, 60 Hz, Non-Interlaced (83.375 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1280    800
#   Scan Frequency  49.628 kHz  60.00 Hz
#   Sync Width      1.631 us    60.450 us
#                   17 chars    3 lines
#   Front Porch     0.768 us    20.15 us
#                   8 chars     1 lines
#   Back Porch      2.399 us    0.483 ms
#                   25 chars    24 lines
#   Active Time     15.352 us   16.120 ms
#                   160 chars   800 lines
#   Blank Time      4.798 us    0.564 ms
#                   50 chars    28 lines
#   Polarity        negative    positive
#
    mode "1280x800-60"
# D: 83.500 MHz, H: 49.702 kHz, V: 60.00 Hz
    geometry 1280 800 1280 800 32 timings 11994 200 72 22 3 128 6 endmode
#
#   1280x960, 60 Hz, Non-Interlaced (108.00 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1280    960
#   Scan Frequency  60.000 kHz  60.00 Hz
#   Sync Width      1.037 us    0.050 ms
#               14 chars    3 lines
#   Front Porch     0.889 us    0.017 ms
#               12 chars    1 lines
#   Back Porch      2.889 us    0.600 ms
#               39 chars    36 lines
#   Active Time     11.852 us   16.000 ms
#               160 chars   960 lines
#   Blank Time      4.815 us    0.667 ms
#               65 chars    40 lines
#   Polarity        positive    positive
#
    mode "1280x960-60"
# D: 108.00 MHz, H: 60.000 kHz, V: 60.00 Hz
    geometry 1280 960 1280 960 32
    timings 9259 312 96 36 1 112 3 hsync high vsync high endmode
#
#   1280x1024, 60 Hz, Non-Interlaced (108.00 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1280        1024
#   Scan Frequency      63.981 kHz  60.02 Hz
#   Sync Width      1.037 us    0.047 ms
#               14 chars    3 lines
#   Front Porch     0.444 us    0.015 ms
#               6 chars     1 lines
#   Back Porch      2.297 us    0.594 ms
#               31 chars    38 lines
#   Active Time     11.852 us   16.005 ms
#               160 chars   1024 lines
#   Blank Time      3.778 us    0.656 ms
#               51 chars    42 lines
#   Polarity        positive    positive
#
    mode "1280x1024-60"
# D: 108.00 MHz, H: 63.981 kHz, V: 60.02 Hz
    geometry 1280 1024 1280 1024 32
    timings 9260 248 48 38 1 112 3 hsync high vsync high endmode
#
#   1280x1024, 75 Hz, Non-Interlaced (135.00 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1280        1024
#   Scan Frequency      79.976 kHz  75.02 Hz
#   Sync Width      1.067 us    0.038 ms
#               18 chars    3 lines
#   Front Porch     0.119 us    0.012 ms
#               2 chars     1 lines
#   Back Porch      1.837 us    0.475 ms
#               31 chars    38 lines
#   Active Time     9.481 us    12.804 ms
#               160 chars   1024 lines
#   Blank Time      3.022 us    0.525 ms
#               51 chars    42 lines
#   Polarity        positive    positive
#
    mode "1280x1024-75"
# D: 135.00 MHz, H: 79.976 kHz, V: 75.02 Hz
    geometry 1280 1024 1280 1024 32
    timings 7408 248 16 38 1 144 3 hsync high vsync high endmode
#
#   1280x1024, 85 Hz, Non-Interlaced (157.50 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1280        1024
#   Scan Frequency  91.146 kHz  85.02 Hz
#   Sync Width      1.016 us    0.033 ms
#               20 chars    3 lines
#   Front Porch     0.406 us    0.011 ms
#               8 chars     1 lines
#   Back Porch      1.422 us    0.483 ms
#               28 chars    44 lines
#   Active Time     8.127 us    11.235 ms
#               160 chars   1024 lines
#   Blank Time      2.844 us    0.527 ms
#               56 chars    48 lines
#   Polarity        positive    positive
#
    mode "1280x1024-85"
# D: 157.50 MHz, H: 91.146 kHz, V: 85.02 Hz
    geometry 1280 1024 1280 1024 32
    timings 6349 224 64 44 1 160 3
    hsync high vsync high endmode mode "1440x900-60"
# D: 106.500 MHz, H: 55.935 kHz, V: 60.00 Hz
    geometry 1440 900 1440 900 32
    timings 9390 232 80 25 3 152 6
    hsync high vsync high endmode mode "1440x900-75"
# D: 136.750 MHz, H: 70.635 kHz, V: 75.00 Hz
    geometry 1440 900 1440 900 32
    timings 7315 248 96 33 3 152 6 hsync high vsync high endmode
#
#   1440x1050, 60 Hz, Non-Interlaced (125.10 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1440        1050
#   Scan Frequency      65.220 kHz  60.00 Hz
#   Sync Width      1.204 us    0.046 ms
#               19 chars    3 lines
#   Front Porch     0.760 us    0.015 ms
#               12 chars    1 lines
#   Back Porch      1.964 us    0.495 ms
#               31 chars    33 lines
#   Active Time     11.405 us   16.099 ms
#               180 chars   1050 lines
#   Blank Time      3.928 us    0.567 ms
#               62 chars    37 lines
#   Polarity        positive    positive
#
    mode "1440x1050-60"
# D: 125.10 MHz, H: 65.220 kHz, V: 60.00 Hz
    geometry 1440 1050 1440 1050 32
    timings 7993 248 96 33 1 152 3
    hsync high vsync high endmode mode "1600x900-60"
# D: 118.250 MHz, H: 55.990 kHz, V: 60.00 Hz
    geometry 1600 900 1600 900 32
    timings 8415 256 88 26 3 168 5 endmode mode "1600x1024-60"
# D: 136.358 MHz, H: 63.600 kHz, V: 60.00 Hz
    geometry 1600 1024 1600 1024 32 timings 7315 272 104 32 1 168 3 endmode
#
#   1600x1200, 60 Hz, Non-Interlaced (156.00 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1600        1200
#   Scan Frequency      76.200 kHz  60.00 Hz
#   Sync Width      1.026 us    0.105 ms
#               20 chars    8 lines
#   Front Porch     0.205 us    0.131 ms
#               4 chars     10 lines
#   Back Porch      1.636 us    0.682 ms
#               32 chars    52 lines
#   Active Time     10.256 us   15.748 ms
#               200 chars   1200 lines
#   Blank Time      2.872 us    0.866 ms
#               56 chars    66 lines
#   Polarity        negative    negative
#
    mode "1600x1200-60"
# D: 156.00 MHz, H: 76.200 kHz, V: 60.00 Hz
    geometry 1600 1200 1600 1200 32 timings 6172 256 32 52 10 160 8 endmode
#
#   1600x1200, 75 Hz, Non-Interlaced (202.50 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1600        1200
#   Scan Frequency  93.750 kHz  75.00 Hz
#   Sync Width      0.948 us    0.032 ms
#               24 chars    3 lines
#   Front Porch     0.316 us    0.011 ms
#               8 chars     1 lines
#   Back Porch      1.501 us    0.491 ms
#               38 chars    46 lines
#   Active Time     7.901 us    12.800 ms
#               200 chars   1200 lines
#   Blank Time      2.765 us    0.533 ms
#               70 chars    50 lines
#   Polarity    positive    positive
#
    mode "1600x1200-75"
# D: 202.50 MHz, H: 93.750 kHz, V: 75.00 Hz
    geometry 1600 1200 1600 1200 32
    timings 4938 304 64 46 1 192 3
    hsync high vsync high endmode mode "1680x1050-60"
# D: 146.250 MHz, H: 65.290 kHz, V: 59.954 Hz
    geometry 1680 1050 1680 1050 32
    timings 6814 280 104 30 3 176 6
    hsync high vsync high endmode mode "1680x1050-75"
# D: 187.000 MHz, H: 82.306 kHz, V: 74.892 Hz
    geometry 1680 1050 1680 1050 32
    timings 5348 296 120 40 3 176 6
    hsync high vsync high endmode mode "1792x1344-60"
# D: 202.975 MHz, H: 83.460 kHz, V: 60.00 Hz
    geometry 1792 1344 1792 1344 32
    timings 4902 320 128 43 1 192 3
    hsync high vsync high endmode mode "1856x1392-60"
# D: 218.571 MHz, H: 86.460 kHz, V: 60.00 Hz
    geometry 1856 1392 1856 1392 32
    timings 4577 336 136 45 1 200 3
    hsync high vsync high endmode mode "1920x1200-60"
# D: 193.250 MHz, H: 74.556 kHz, V: 60.00 Hz
    geometry 1920 1200 1920 1200 32
    timings 5173 336 136 36 3 200 6
    hsync high vsync high endmode mode "1920x1440-60"
# D: 234.000 MHz, H:90.000 kHz, V: 60.00 Hz
    geometry 1920 1440 1920 1440 32
    timings 4274 344 128 56 1 208 3
    hsync high vsync high endmode mode "1920x1440-75"
# D: 297.000 MHz, H:112.500 kHz, V: 75.00 Hz
    geometry 1920 1440 1920 1440 32
    timings 3367 352 144 56 1 224 3
    hsync high vsync high endmode mode "2048x1536-60"
# D: 267.250 MHz, H: 95.446 kHz, V: 60.00 Hz
    geometry 2048 1536 2048 1536 32
    timings 3742 376 152 49 3 224 4 hsync high vsync high endmode
#
#   1280x720, 60 Hz, Non-Interlaced (74.481 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1280        720
#   Scan Frequency      44.760 kHz  60.00 Hz
#   Sync Width      1.826 us    67.024 ms
#               17 chars    3 lines
#   Front Porch     0.752 us    22.341 ms
#               7 chars     1 lines
#   Back Porch      2.578 us    491.510 ms
#               24 chars    22 lines
#   Active Time     17.186 us   16.086 ms
#               160 chars   720 lines
#   Blank Time      5.156 us    0.581 ms
#               48 chars    26 lines
#   Polarity        negative    negative
#
    mode "1280x720-60"
# D: 74.481 MHz, H: 44.760 kHz, V: 60.00 Hz
    geometry 1280 720 1280 720 32 timings 13426 192 64 22 1 136 3 endmode
#
#   1920x1080, 60 Hz, Non-Interlaced (172.798 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1920        1080
#   Scan Frequency      67.080 kHz  60.00 Hz
#   Sync Width      1.204 us    44.723 ms
#               26 chars    3 lines
#   Front Porch     0.694 us    14.908 ms
#               15 chars     1 lines
#   Back Porch      1.898 us    506.857 ms
#               41 chars    34 lines
#   Active Time     11.111 us   16.100 ms
#               240 chars   1080 lines
#   Blank Time      3.796 us    0.566 ms
#               82 chars    38 lines
#   Polarity        negative    negative
#
    mode "1920x1080-60"
# D: 74.481 MHz, H: 67.080 kHz, V: 60.00 Hz
    geometry 1920 1080 1920 1080 32 timings 5787 328 120 34 1 208 3 endmode
#
#   1400x1050, 60 Hz, Non-Interlaced (122.61 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1400        1050
#   Scan Frequency      65.218 kHz  59.99 Hz
#   Sync Width      1.037 us    0.047 ms
#               19 chars    3 lines
#   Front Porch     0.444 us    0.015 ms
#               11 chars     1 lines
#   Back Porch      1.185 us    0.188 ms
#               30 chars    33 lines
#   Active Time     12.963 us   16.411 ms
#               175 chars   1050 lines
#   Blank Time      2.667 us    0.250 ms
#               60 chars    37 lines
#   Polarity        negative    positive
#
    mode "1400x1050-60"
# D: 122.750 MHz, H: 65.317 kHz, V: 59.99 Hz
    geometry 1400 1050 1408 1050 32
    timings 8214 232 88 32 3 144 4 endmode mode "1400x1050-75"
# D: 156.000 MHz, H: 82.278 kHz, V: 74.867 Hz
    geometry 1400 1050 1408 1050 32 timings 6410 248 104 42 3 144 4 endmode
#
#   1366x768, 60 Hz, Non-Interlaced (85.86 MHz dotclock)
#
#               Horizontal  Vertical
#   Resolution      1366        768
#   Scan Frequency      47.700 kHz  60.00 Hz
#   Sync Width      1.677 us    0.063 ms
#               18 chars    3 lines
#   Front Porch     0.839 us    0.021 ms
#               9 chars     1 lines
#   Back Porch      2.516 us    0.482 ms
#               27 chars    23 lines
#   Active Time     15.933 us   16.101 ms
#               171 chars   768 lines
#   Blank Time      5.031 us    0.566 ms
#               54 chars    27 lines
#   Polarity        negative    positive
#
    mode "1360x768-60"
# D: 84.750 MHz, H: 47.720 kHz, V: 60.00 Hz
    geometry 1360 768 1360 768 32
    timings 11799 208 72 22 3 136 5 endmode mode "1366x768-60"
# D: 85.86 MHz, H: 47.700 kHz, V: 60.00 Hz
    geometry 1366 768 1366 768 32
    timings 11647 216 72 23 1 144 3 endmode mode "1366x768-50"
# D: 69,924 MHz, H: 39.550 kHz, V: 50.00 Hz
    geometry 1366 768 1366 768 32 timings 14301 200 56 19 1 144 3 endmode

The Linux Kernel

Contents

This Page

VIA Integration Graphic Chip Console Framebuffer Driver¶

Platform¶

Driver features¶

Using the viafb module¶

Configure viafb with "fbset" tool¶

Configure viafb via /proc¶

Bootup with viafb¶

VIA Framebuffer modes¶