LVDS Support

Michael Robinson mrobinson at
Fri Jun 25 14:42:00 CEST 2004

 From what I've read it appears that the actual GPU is built into the 
Northbridge with integrated 8x AGP but the output is handled by 
different chips depending on what format you want to output in (ie 
Composite, VGA, LVDS).  The chipset homepage is here: and apparently the LVDS 
chip is a Chrontel 7019A (VIA's part number for it is the LVDS-01).  
I've uploaded the PDF datasheet for the LVDS-01 here:  I'll Google this chip 
and see if anyone else has had any luck with it on Linux.

Michael Robinson
mrobinson at

Richard Smith wrote:

> Michael Robinson wrote:
>> It looks like LVDS is a BIOS only thing, all of the pages on getting 
>> it running under Linux refer you back to the BIOS... Hmm...
> Thats because thats normally a bios/vbios type deal.  When you are 
> dealing with a panel direct its a whole different ball game.
> Do you know if the LVDS is part of the EPIA video system or if its 
> seperate descrete chips?
> LVDS has a couple of flavors depending on what type of panel you are 
> talking to.  So the vbios will normally query the system bios for a 
> panel type or some bios config setting.  Based on the panel type it 
> will set the internal chip registers or toggle gpio lines to put 
> descrete chips in the right mode.
> CRTC Timeings are also panel specific.  There are VESA timeings but 
> lots of panels still need tweaking.
> some linux fb drivers and X drivers can deal with these issues but for 
> legacy VGA mode the vbios enables some video sytem trickery.

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