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    SubjectRe: i915 regression in 2.6.29-rc5

    * Zhang Rui <rui.zhang@intel.com> wrote:

    > On Thu, 2009-02-19 at 03:33 +0800, Yinghai Lu wrote:
    > > On Tue, Feb 17, 2009 at 7:24 PM, ZhangRui <rui.zhang@intel.com> wrote:
    > > > Hi, all,
    > > >
    > > > I got an i915 failure in 2.6.29-rc5.
    > > >
    > > > problem description: the screen doesn't come back after suspend/resume.
    > > > A workaround is to boot with "nomodesetting".
    > > >
    > > > I got this error message during i915 driver load time,
    > > > [ 22.606749] mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining
    > > > [ 22.606752] [drm] MTRR allocation failed
    > > > [ 22.606753] . Graphics performance may suffer.
    > >
    > > CONFIG_MTRR_SANITIZER=y
    > > CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
    > > CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1
    > >
    > > may help this one.
    > >
    > hah, it helps.
    > the screen is back with this, while my previous kernel option is same
    > except that CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=0.

    Ok, great. I think we should flip the default of
    MTRR_SANITIZER_ENABLE_DEFAULT from 0 to 1 in 2.6.30,
    as we now seem to a better job of sorting out MTRRs
    details than X does.

    Yinghai, mind sending a patch for that?

    Ingo
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