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Date: Sat, 27 Feb 2010 08:49:06 -0800
From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Markus Rechberger <mrechberger@gmail.com>, Greg KH <greg@kroah.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       linux-usb@vger.kernel.org, werner@guyane.dyn-o-saur.com,
       Marcus Meissner <meissner@suse.de>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.33 bugs (USBFS, Intel graphic)
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On Sat, 27 Feb 2010 14:17:14 +0200
Pekka Enberg <penberg@cs.helsinki.fi> wrote:

> On Sat, Feb 27, 2010 at 2:15 PM, Pekka Enberg
> <penberg@cs.helsinki.fi> wrote:
> > On Sat, Feb 27, 2010 at 1:00 PM, Markus Rechberger
> > <mrechberger@gmail.com> wrote:
> >>> Linus, I know you didn't want to do a kzalloc, but it looks like
> >>> this is the easiest/simplest thing to do, unless you can think of
> >>> something else?
> >>
> >> do you have any idea what to cherrypick in order to get rid of that
> >> flickering with the intel GM45?
> >> The flickering itself occures randomly, it was not there with the
> >> original Ubuntu kernel (2.6.31 with alot patches)
> >> This is pretty much a standard graphicchip nowadays....
> >
> > Yeah, same here. I tried to bisect the damn thing but didn't find
> > any single commit. I think the problem was introduced in in the DRM
> > merge between 2.6.31 and 2.6.32-rc1. Some people suggested
> > privately that it might be related to frame buffer compression.
> > Unfortunately I wasn't able to revert that particular patch.
> 
> Btw, after I reinstalled Ubuntu 9.10 from scratch for unrelated
> reasons, I haven't seen the flicker effect. Dunno if that's just a
> coincidence or if userspace has something to do with the bug.

Some people reported ACPI related flicker due to lid detection taking a
long time and X periodically probing for it.  Maybe that's what you
were seeing?

-- 
Jesse Barnes, Intel Open Source Technology Center
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