[Intel-gfx] R31 dithering

[Ville Syrjälä]

On Fri, Mar 27, 2015 at 07:57:52PM +0100, Thomas Richter wrote:
> Hi Daniel, hi Ville,
> 
> thanks for your help. I used now the debug output to research how to 
> enable dithering on the intel VCH. Apparently, it is bit #4 in register
> VR01 that enables dithering. This is cross-checked by enabling in the
> dvo_ivch.c file, which greatly improves image quality for 24bpp output. 
> The bit itself is documented as "reserved" in the intel documentation, 
> though it works quite nicely here.
> 
> I will now cross-check a little bit which other side effects this bit
> has if combined with other DVO features (16bpp output, and scaler 
> enabled). As soon as I have more, I'll prepare a small kernel patch for
> it.
> 
> Thanks and have a nice weekend,

BTW I think this bug is about failure to restore the ivch to proper
state after suspend (on X30): https://bugs.freedesktop.org/show_bug.cgi?id=49838
Just in case you're looking for more stuff to do around the ivch ;)

-- 
Ville Syrjälä
Intel OTC