linux-kernel - Re: Regression: i915 blank issue on kernel 3.1.0-rc3

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Message-ID: <4E7F2983.3050407@gmail.com>
Date:	Sun, 25 Sep 2011 09:15:47 -0400
From:	Woody Suwalski <terraluna977@...il.com>
To:	Keith Packard <keithp@...thp.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Chris Wilson <chris@...is-wilson.co.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re:  Regression: i915 blank issue on kernel 3.1.0-rc3

Keith Packard wrote:
> On Wed, 21 Sep 2011 19:02:05 -0400, Woody Suwalski<terraluna977@...il.com>  wrote:
>
>> Chris, I do not know if it is i915 driver or X'drm or what..
>> Problem exists on 3.1.0, no problem on 3.0.3
> Any way you could narrow it down a bit more? A bisect should sort it out
> pretty quickly, given that you've got working code in 3.0 and
> not-working code in 3.1-rc. You can start by manually bisecting across the
> 3.1 release candidates, and then narrow it down from there by bisecting
> only across the drivers/gpu/drm/i915 directory.
Yes, I have narrowed it down. I did not run bisect, as it takes me 4hrs 
for kernel build on Eeepc...

The problem has appeared in 3.1-rc3, it is a regression.
I have tested -rc1 and -rc2, they are OK ( not that there was much 
activity regarding i915 in -rc2). The problem is still present in -rc7.

I see these entries in the changelog, these are Keith's additions to 
-rc3 which maight impact the blanker:

Keith Packard (6):
       drm/i915: Wait for LVDS panel power sequence
       drm/i915: Leave LVDS registers unlocked
       drm/i915: Fix PCH port pipe select in CPT disable paths
       drm/i915: Remove unused 'reg' argument to dp_pipe_enabled
       drm/i915: Can't do accurate vblank timestamps with UMS
       drm/i915: Cannot set clock gating under UMS

I can do a fast incremental rebuild of my current -rc3 tree, if Keith could send me some patches...

Thanks, Woody


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