Re: [Qemu-devel] [PULL 3/3] cirrus: Fix host CPU blits

[Benjamin Herrenschmidt]

On Mon, 2014-07-14 at 17:29 +1000, Benjamin Herrenschmidt wrote:
> On Mon, 2014-07-14 at 09:24 +0200, Peter Lieven wrote:
> > it seems you have digged into the cirrus code recently. Have you an idea 
> > how to
> > fix the issue with the graphics corruption for cirrus vga and recent X 
> > Server versions?
> > 
> > E.g. take an Ubuntu 14.04 Desktop CD, boot it into live mode and open 
> > terminal.
> > 
> > I have tried to debug it a little, but I have no clue how to solve this. I 
> > tried to get
> > hands on a real hardware Cirrus Logic Graphics card and test if this 
> > happens there as well,
> > but I had no chance to get one.
> 
> I *think* it is a X server side bug. They broke 24bpp packed pixel
> format. I've seen patches submitted to the Xorg list fairly recently by
> somebody from canonical.
> 
> You can test by creating an xorg.conf to force the display to 16bpp
> instead of 24 and see if that helps.

Look for patches from "Robert Ancell <address@hidden>" on
the xorg-devel list. In fact I'd suggest you test and report if that
works for you, that might give Keithp an incentive for actually merging
them :-)

Cheers,
Ben.