From: Chris Wilson <chris@chris-wilson.co.uk>
To: Dave Airlie <airlied@gmail.com>, Harald Dunkel <harri@afaics.de>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: Intel 82915G/GV/910GL, 2.6.36.2: problem with CONFIG_DRM_I915_KMS=y
Date: Fri, 17 Dec 2010 01:15:31 +0000 [thread overview]
Message-ID: <5b55a1$ivogvh@fmsmga002.fm.intel.com> (raw)
In-Reply-To: <AANLkTi=jeJriExzNVRxbApz9VEUeuL0BpVLnRoTx_SrT@mail.gmail.com>
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On Fri, 17 Dec 2010 10:01:26 +1000, Dave Airlie <airlied@gmail.com> wrote:
> (cc'ing Chris).
>
> On Fri, Dec 17, 2010 at 8:23 AM, Harald Dunkel <harri@afaics.de> wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > Hi folks,
> >
> > according to http://bugs.debian.org/607300 I have to rebuild 2.6.36.2
> > with CONFIG_DRM_I915_KMS=y. Problem:
> >
> > At boot time I get a message "waiting for /dev to be fully populated",
> > then the screen goes blank and the monitor enters power save mode.
> > 2.6.36.2 without CONFIG_DRM_I915_KMS didn't show this problem.
> >
> > My grub2 configuration says
> >
> > GRUB_GFXMODE=1280x1024
> > GRUB_GFXPAYLOAD_LINUX="keep"
> >
> > If I comment out these 2 lines and rebuild grub.cfg, then the problem
> > goes away, too. I just get a 80x25 display for grub in this case.
> >
>
> Is this a regression since 2.6.36 or 2.6.35?
Sounds like:
commit 47f1c6c9ffdec0c0e5a2c2709bd63c7380b325c4
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri Dec 3 15:37:31 2010 +0000
drm/i915: Clean conflicting modesetting registers upon init
If we leave the registers in a conflicting state then when we attempt
to teardown the active mode, we will not disable the pipes and planes
in the correct order -- leaving a plane reading from a disabled pipe and
possibly leading to undefined behaviour.
Reported-and-tested-by: Andy Whitcroft <apw@canonical.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=32078
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
which was prompted by an investigation as to why grub2 was causing a
modesetting failure.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
next prev parent reply other threads:[~2010-12-17 1:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-16 22:23 Harald Dunkel
2010-12-17 0:01 ` Dave Airlie
2010-12-17 1:15 ` Chris Wilson [this message]
2010-12-18 12:53 ` Harald Dunkel
2010-12-23 5:41 ` Harald Dunkel
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