Intel 855GM/Chrontel 7011A: S-Video on Xorg

Alan Hourihane alanh at
Sat Apr 9 09:56:06 PDT 2005

On Sat, Apr 09, 2005 at 12:23:21PM -0400, Andrew Barr wrote:
> Hi.
> I have an IBM ThinkPad R51 with an Intel 82855GM graphics chip. I am trying to 
> get the S-Video out to work under 6.8.2 (Gentoo Linux). The encoder 
> chip (according to 'nvtv -P') is a Chrontel 7011A. I have tried two scenarios 
> to get the TV-out port working:
> - the open-source i810 driver. The driver will not start at 800x600 (which is 
> evidently what the encoder runs at). It says "no mode of this name". It will 
> start at either 1024x768 or 640x480. So, although an image appears on the TV 
> screen, it is constantly rolling, presumably from an incorrect resolution. I 
> use:
> 	Option "MonitorLayout" "LFP,TV"
> to activate the TV-out.
O.k. First off your TVout interface doesn't support 1024x768, only
800x600 and 640x480. So I'm not sure why you think it's starting with
1024x768. As for the rolling picture, have you checked the BIOS to
see if it's supporting NTSC or PAL or some other format and that your
TV supports that ?

> - the binary-only IEGD driver. Using:

We can't help with the IEGD driver as that's Intel proprietary.


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