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Old 12-23-05, 12:03 PM   #1
korpenkraxar
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Join Date: Dec 2005
Posts: 7
Default Can we use virtual screen sizes to compensate for overscanning?

Hi! I'm using an MSI 6200 HDTV card, sending a 1920x1080i signal to my JVC TV-set using component output. The TV overscans the signal quite badly however - I can see something like 1700x1000 pixels. Is there any way in which I can compensate for this by configuring my xorg.conf file - can I set a smaller virtual screen by using a custom modeline or perhaps TwinView that also works for fullscreen video?

I have for instance tried these modified modeline below, but they and other variants does not work.

Original (working):
Modeline "1920x1080i" 74.52 1920 1952 2016 2208 1080 1084 1096 1126 -HSync -VSync Interlace

Modified (not working):
Modeline "1920x1080i_virt" 74.52 1712 1952 2016 2208 963 1084 1096 1126 -HSync -VSync Interlace

Modified (not working):
Modeline "1920x1080@65i" 85.12 1800 1952 2272 2304 1000 1104 1110 1135 interlace

Error message: Not using mode whatever (not a valid TV mode)

The only accepted ones are:

(**) NVIDIA(0): Validated modes for display device TV-0:
(**) NVIDIA(0): Mode "800x600PAL": 36.0 MHz, 37.5 kHz, 50.0 Hz
(**) NVIDIA(0): Mode "640x480PAL": 29.5 MHz, 31.2 kHz, 50.0 Hz
(**) NVIDIA(0): Default mode "1024x768": 65.0 MHz, 48.4 kHz, 60.0 Hz
(**) NVIDIA(0): Default mode "800x600": 40.0 MHz, 37.9 kHz, 60.3 Hz
(**) NVIDIA(0): Default mode "800x600": 81.0 MHz, 75.0 kHz, 60.0 Hz (D)
(**) NVIDIA(0): Default mode "800x600": 36.0 MHz, 35.2 kHz, 56.2 Hz
(**) NVIDIA(0): Default mode "640x480": 25.2 MHz, 31.5 kHz, 60.0 Hz
(**) NVIDIA(0): Default mode "640x480": 54.0 MHz, 60.0 kHz, 60.0 Hz (D)
(**) NVIDIA(0): Default mode "640x400": 41.7 MHz, 49.7 kHz, 60.0 Hz (D)
(**) NVIDIA(0): Default mode "400x300": 20.0 MHz, 37.9 kHz, 60.3 Hz (D)
(**) NVIDIA(0): Default mode "400x300": 18.0 MHz, 35.2 kHz, 56.3 Hz (D)
(**) NVIDIA(0): Default mode "320x240": 12.6 MHz, 31.5 kHz, 60.1 Hz (D)

Where my custom PAL ones look like this:

Modeline "800x600PAL" 36.00 800 816 820 960 600 653 655 750
Modeline "640x480PAL" 29.50 640 676 680 944 480 530 535 625

I am using the latest 8178 drivers. Can TwinView help me set a smaller virtual screen here? Or second best - which media players can play fullscreen centerd with a zoom factor like 0.85? VLC? Mplayer?
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