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SubjectRe: [PROBLEM] mtrr's not set, 2.6.13
Jim McCloskey <mcclosk@ucsc.edu> wrote:
>
> I'm not sure who to report this to ....

This works.

> Somewhere between 2.6.11.3 and 2.6.12 (also under 2.6.13), the
> following change occurred on this box.
>
> Under 2.6.11.3, mtrr ranges are automatically set when X is started:
>
> ----------------------------------------------------------------------
> running 2.6.11.3:
>
> cat /proc/mtrr
> reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1
> reg01: base=0xe8000000 (3712MB), size= 128MB: write-combining, count=2
> reg02: base=0xe0000000 (3584MB), size= 128MB: write-combining, count=1
> ----------------------------------------------------------------------
>
> After installation of 2.6.12/13, mtrr ranges are not set:
>
> ----------------------------------------------------------------------
> running 2.6.13:
>
> Xorg.0.log:
>
> (WW) RADEON(0): Failed to set up write-combining range (0xe8000000,0x8000000)
>
> /var/log/messages:
>
> Aug 30 17:37:13 localhost kernel: mtrr: type mismatch for e8000000,8000000 old: write-back new: write-combining
> Aug 30 17:37:14 localhost kernel: mtrr: type mismatch for e0000000,8000000 old: write-back new: write-combining
> Aug 30 17:37:14 localhost kernel: [drm] Initialized radeon 1.16.0 20050311 on minor 0: ATI Technologies Inc RV280 [Radeon 9200]
> Aug 30 17:37:14 localhost kernel: mtrr: type mismatch for e8000000,8000000 old: write-back new: write-combining
>
> cat /proc/mtrr
> reg00: base=0x00000000 ( 0MB), size=983552MB: write-back, count=1
> ----------------------------------------------------------------------
>
> Under 2.6.13 it's fairly easy to force a crash of the X server (e.g. by
> playing Tuxracer badly).
>
> The only change here is in the kernel-version. I haven't tried all the
> point releases between 2.6.11.3 and 2.6.12, but the relevant Changelogs
> don't suggest that anything relevant changed.

In a 2.6.13 tree could you please do

wget ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.13-rc2/2.6.13-rc2-mm1/broken-out/mtrr-suspend-resume-cleanup.patch
patch -p1 -R < mtrr-suspend-resume-cleanup.patch

and retest?

Thanks.
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