Bug#523415: corrupted rendering

[Kurt Roeckx <kurt@roeckx.be>]

On Tue, Jun 09, 2009 at 07:11:37AM +0200, Brice Goglin wrote:
> Kurt Roeckx wrote:
> > On Thu, Apr 16, 2009 at 10:38:43PM +0200, Brice Goglin wrote:
> >   
> >> Kurt Roeckx wrote:
> >>     
> >>> That removes the line, but does not solve the problem.
> >>>   
> >>>       
> >> Right, removing write-combining is only supposed to decrease performance :)
> >>     
> >
> > So I'm still seeing this problem with the latest version in
> > unstable (2:2.7.1-1) and kernel linux-image-2.6.29-2-686
> > 2.6.29-5.
> >
> > Do you have any other idea what we can try?
> >   
> 
> Did you try a 2.6.30-rc* kernel? Some packages are available at
> http://kernel-archive.buildserver.net/debian-kernel/

linux-image-2.6.30-rc8-686 fixed my problem.

/proc/mtrr now looks like:
reg00: base=0x000000000 (    0MB), size=  256MB, count=1: write-back
reg01: base=0x00ff00000 (  255MB), size=    1MB, count=1: uncachable
reg02: base=0x0f0000000 ( 3840MB), size=  128MB, count=2: write-combining

I had:
2.6.28:
reg00: base=0x000000000 (    0MB), size= 1024MB, count=1: write-back
reg01: base=0x03ff00000 ( 1023MB), size=    1MB, count=1: uncachable

/proc/mtrr in 2.6.29:
reg00: base=0x000000000 (    0MB), size= 1024MB, count=1: write-back
reg01: base=0x03ff00000 ( 1023MB), size=    1MB, count=1: uncachable
reg02: base=0x0e8000000 ( 3712MB), size=  128MB, count=2: write-combining

Notice the 1024 MB changed to 256 MB.


Kurt