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

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Date:	Thu, 15 Oct 2009 00:02:04 -0400
From:	Theodore Tso <tytso@....edu>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"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 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.

						- Ted

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