18/24 bit LVDS output with "i810" or "intel" driver

Eric Anholt eric at anholt.net
Fri May 2 15:14:28 PDT 2008

On Fri, 2008-05-02 at 13:05 +0200, Jan Kandziora wrote:
> Hello,
> we use embedded boards (Kontron KEEX-4000) with the Intel 852GM graphics chip 
> for some cash register device. It has a 24 bit TFT display with LVDS input. 
> Our pilot lot worked good so far.
> Lately, the board vendor delivered the first regular lot, which had only 
> support for 18 bit LVDS display in the BIOS. So the 24 bit display is too 
> dark, as it only gets 25% saturation from the board. I know this is the board 
> vendor's fault, but I'm a little in the hurry so I don't want to wait several 
> weeks until we get an updated BIOS. So my question:
> Is there any quick and dirty hack to enable the 24 bit LVDS serializing at 
> least in the i810/intel xorg driver? The 852GM chip supports it, says its 
> documentation.
> I could apply a patch, even develop one myself. I just need some in-deep 
> pointers.

Option "LVDS24Bit" "YES"

Looks like Zhenyu failed to fix the manpage when he committed the patch.

Eric Anholt                             anholt at FreeBSD.org
eric at anholt.net                         eric.anholt at intel.com

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