linux-kernel - Re: 2.6.32 regression (bisected): Video tearing/glitching with T400 laptops

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Date:	Mon, 19 Oct 2009 10:15:26 +0900
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Theodore Tso <tytso@....edu>,
	"Carlos R. Mafra" <crmafra2@...il.com>,
	Eric Anholt <eric@...olt.net>, linux-kernel@...r.kernel.org,
	Keith Packard <keithp@...thp.com>,
	Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: 2.6.32 regression (bisected): Video tearing/glitching with T400
 laptops

On Mon, 19 Oct 2009 10:04:37 +0900
Jesse Barnes <jbarnes@...tuousgeek.org> wrote:

> On Thu, 15 Oct 2009 00:02:04 -0400
> Theodore Tso <tytso@....edu> wrote:
> 
> > On Wed, Oct 14, 2009 at 10:26:45PM -0400, Theodore Tso wrote:
> > > 
> > > If I need to live with a display glitch every 5-10 minutes or so
> > > to get better power savings, I'll take it....
> > > 
> > 
> > While mail reading and composing responses in a tty based mail
> > reader (mutt/emacs -nw), I'm seeing display glitches every 3-5
> > minutes.  Each time it's quite minor so it's the sort of thing
> > which is definitely "blink at the wrong time and you'll miss it".
> > 
> > Being a battery lifetime freak, I'll definitely take the tradeoff,
> > but given that it occurs even when I'm plugged into AC mains, I
> > could see some users being annoyed by it, and I could see them
> > wanting to be able to switch off the feature when they are on AC,
> > if we find a complete fix.
> 
> Ok, hopefully this is the "correct" patch.  It works for me, can you
> give it a try?

Here's an even more "final" patchset with some spurious hunks removed.

Thanks,
Jesse

View attachment "0001-drm-i915-enable-self-refresh-on-965.patch" of type "text/x-patch" (2699 bytes)

View attachment "0002-drm-i915-add-FIFO-watermark-support-for-G4x.patch" of type "text/x-patch" (5206 bytes)