[Intel-gfx] [PATCH] honor VBIOS SSC & TV settings

[Erik Andrén]

Hi,

Jesse Barnes wrote:
> On Thursday, June 26, 2008 9:36 am Jesse Barnes wrote:
>> I've been doing some work lately to use more of the VBIOS settings where
>> possible.  This patch adds support for using the VBIOS for TV connector
>> detection and SSC information.  On my T61 at least, using this patch keeps
>> me from having to use the T61 TV ignore quirk.
>>
>> SSC (spread spectrum clock) is a EMI reducing feature 855+ chips support. 
>> It allows the OEM to provide an external reference clock and connect it to
>> the GPU to modulate the display clock frequency.  Since it requires an
>> external part, information about its presence and frequency is supposed to
>> be in the VBIOS general info block.
>>
>> I'm not sure how accurate the VBIOS info is for either TV or SSC info, so
>> I'd like to get some feedback.  Can people give this a try?  It disables
>> the TV quirk logic, so it'll rely on the VBIOS for getting TV output
>> presence info. And it will unconditionally use SSC if it finds it, so
>> you'll see a message like
>> (II) intel(0): using SSC reference clock of 100 MHz
>> in your log if it ends up getting used.
>>
>> Please provide testing feedback on both features as a reply to this
>> message.
> 
> Oh and the patch. :)

Using this patch on my Clevo laptop with a 965GM chipset works fine.
This machine previously needed a quirk as it misdetected an S-video 
output (which it lacks).
This patch was applied on the 2.3.2 branch and the system is running 
ubuntu hardy heron (8.04).

I'm attaching my xorg.log as a reference.

Regards,
Erik

> 
> Jesse
> 
> 
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