Kernel Bug Tracker – Bug 23762
kernel 2.6.37-rc2 breaks i915 graphics
Last modified: 2010-12-19 11:33:21 UTC
Subject : kernel 2.6.37-rc2 breaks i915 graphics
Submitter : Chris Vine <firstname.lastname@example.org>
Date : 2010-11-21 10:23
Message-ID : email@example.com
References : http://marc.info/?l=linux-kernel&m=129033505414671&w=2
This entry is being used for tracking a regression from 2.6.36. Please don't
close it until the problem is fixed in the mainline.
On Saturday, December 04, 2010, Chris Vine wrote:
> On Fri, 3 Dec 2010 00:41:46 +0100 (CET)
> "Rafael J. Wysocki" <firstname.lastname@example.org> wrote:
> > This message has been generated automatically as a part of a summary
> > report of recent regressions.
> > The following bug entry is on the current list of known regressions
> > from 2.6.36. Please verify if it still should be listed and let the
> > tracking team know (either way).
> > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=23762
> > Subject : kernel 2.6.37-rc2 breaks i915 graphics
> > Submitter : Chris Vine <email@example.com>
> > Date : 2010-11-21 10:23 (12 days old)
> Yes, it should still be in the list of regressions. The bug is still
> present in kernel 2.6.37-rc4.
Sounds related to:
Author: Chris Wilson <firstname.lastname@example.org>
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 <email@example.com>
Signed-off-by: Chris Wilson <firstname.lastname@example.org>
But there is insufficient information to ascertain what is happening.
Comment #2: The bug was not fixed by a commit of 3 December, unless it did not get into Linus's tree until after 2.6.37-rc5, but it is fixed in 2.6.37-rc6, so it may be something else. (My e-mail to you of 21 November indicated that the bug was introduced between 2.6.37-rc1 and 2.6.37-rc2, if that helps.)
Comment #3: My e-mail to you of 21 November ( http://marc.info/?l=linux-kernel&m=129036448009024&w=2 ) provided what you had earlier asked for, and the original bug report contained some other information which you can see at the link provided by Rafael. What additional information would you like?
Sorry, missed the reply. Had I searched my inbox for the msg-id, I would have your replies, which do indicate similar symptoms that prompted that patch.
That was merged into linus/master:
Merge: f8f5d4f 599bbb9
Author: Linus Torvalds <email@example.com>
Date: Wed Dec 8 06:34:39 2010 -0800