mrobinson at fuzzymuzzle.com
Fri Jun 25 15:07:00 CEST 2004
Well, it seems that the SiS driver supports it, just search for 7019
(all references to it in Google are without the "A") on this page:
http://www.xfree86.org/4.4.0/sis.4.html So it must be fairly easy to
port the code to the VIA, although the SiS driver most likely takes into
account that the BIOS contains display information. All references to
the 7019 go to the SiS driver, it must be the only one that implements
the LVDS interface.
Michael Robinson wrote:
> 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:
> http://www.via.com.tw/en/c-series/cle266.jsp 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:
> http://www.fuzzymuzzle.com/uploads/LVDS-01.pdf I'll Google this chip
> and see if anyone else has had any luck with it on Linux.
> Michael Robinson
> mrobinson at fuzzymuzzle.com
> 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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