linux-kernel - Re: 2.6.33-rc2: Reported regressions from 2.6.32

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Date:	Sun, 17 Jan 2010 16:18:39 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	"Michael S. Tsirkin" <m.s.tsirkin@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Network Development <netdev@...r.ker>
Subject: Re: 2.6.33-rc2: Reported regressions from 2.6.32

On Sun, Jan 17, 2010 at 2:32 PM, Michael S. Tsirkin
<m.s.tsirkin@...il.com> wrote:
> On Sat, Jan 16, 2010 at 02:04:07PM -0800, Linus Torvalds wrote:
>>
>>
>> On Sat, 16 Jan 2010, Rafael J. Wysocki wrote:
>> >
>> > > Immediately upon startup, screen is flickering (becomes
>> > > lighter and darker again). The problem occurs with kernels
>> > > 2.6.33-rc1 to 2.6.33-rc4, but not with kernel 2.6.32 and below.
>> >
>> > We've already had several reports like this already.
>> >
>> > Care to review the bugs linked to http://bugzilla.kernel.org/show_bug.cgi?id=14885
>> > and check if none of them matches the problem you describe?
>>
>> I suspect that should be fixed by commit 33814341f22 ("drm/i915: disable
>> LVDS downclock by default") that got merged today.
>>
>> So try current -git.
>>
>>               Linus
>
>
> Tested with 6ccf80eb15ccaca4d3f1ab5162b9ded5eecd9971, still get
> the flickering effect. so 33814341f22 does not seem to help.

Yeah, me too which is why I am doing a git bisect here. What's strange
about it is that the first bisection point seems to suggest that the
regression happened _before_ the DRM merge to 2.6.33-rc1. I guess it's
possible that the bug is already in 2.6.32 but I've yet to see the
flickering effect. Oh well, back to bisect...

                        Pekka
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