Re: i915 regression in 2.6.29-rc5

Zhang Rui
2009-02-19T03:56:24Z

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.

Btw: with jesse's patch applied, the symptom is exactly the same as the
one I stated in the previous email.

thanks,
rui