linux-kernel - Re: 2.6.33 bugs (USBFS, Intel graphic)

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Message-ID: <20100227084906.6b05fa5e@jbarnes-piketon>
Date:	Sat, 27 Feb 2010 08:49:06 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Markus Rechberger <mrechberger@...il.com>,
	Greg KH <greg@...ah.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-usb@...r.kernel.org, werner@...ane.dyn-o-saur.com,
	Marcus Meissner <meissner@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.33 bugs (USBFS, Intel graphic)

On Sat, 27 Feb 2010 14:17:14 +0200
Pekka Enberg <penberg@...helsinki.fi> wrote:

> On Sat, Feb 27, 2010 at 2:15 PM, Pekka Enberg
> <penberg@...helsinki.fi> wrote:
> > On Sat, Feb 27, 2010 at 1:00 PM, Markus Rechberger
> > <mrechberger@...il.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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