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

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Date:	Sat, 27 Feb 2010 14:17:14 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Markus Rechberger <mrechberger@...il.com>
Cc:	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,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: 2.6.33 bugs (USBFS, Intel graphic)

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.
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