[Openchrome-users] DFP problems on Samsung NC20

[Xavier Bachelot]

Matthieu Herrb wrote:
> Hi
> 
> since revision 742 of the driver (VX800 integrated TMDS support), I get
> a black screen on the NC20 if running without and xorg.conf file.
> Reverting that revision, or using an xorg.conf file that forces 'Option
> "ActiveDevice" "LCD"' fixes the problem.
> 
> after looking a bit closer to the code, this option as the effect of
> ignoring the BIOS that pretends to support VIA_DEVICE_DFP.
> 
> I don't know what the right fix could be, may be a new kind of model
> depend quirk table is needed to disable the TDMS support on specific models?
> 
> The patch attached, only enables it if the ViaCardId entry for a card
> explicitely lists VIA_DEVICE_DFP. I don't know if it's the right
> approach or not.
> 
Using a table doesn't really scale, we need better outputs detection imho.
I'd rather force the use of the ActiveDevice option to enable DFP for
now. There are only a handful of boards with DVI output anyway (Epia
M700, are there others ?).
The attached patch shouldn't enable DFP output unless ActiveDevice is
explicitly set to DFP. Does it do the job for you ?

Regards,
Xavier





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