Re: [Fwd: [PATCH][matroxfb] G450 jittery display on ppc systems]

["Paul A. Clarke" <pc@us.ibm.com>]

Petr Vandrovec wrote:
> Paul A. Clarke wrote:
>> Just a polite nudge on this patch
[...]
> It looks fine to me.  Except that I'd like to know why this has to be 
> done - is it something common to all DVI displays, or something you got 
> hint on from Matrox, or ... ?

I believe it is common to all systems where the initialization code (BIOS, 
FCODE, etc.) doesn't leave the card in a completely viable state.  It's not a 
DVI-specific thing in that I still can't get any DVI signals, but it does appear 
from my tests that this line is the most significant line in the patch:

+                matroxfb_DAC_out(PMINFO M1064_XDVICLKCTRL, 0);

And, I got some hints from Matrox.  :-)
-- 
Regards,
Paul Clarke


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