linux-kernel - [REGRESSION]: hibernate/sleep regression w/ bisection

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Message-ID: <20111101124759.GA1326@zeus>
Date:	Tue, 1 Nov 2011 07:48:19 -0500
From:	Andrew Watts <akwatts@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-pm@...ts.linux-foundation.org, tj@...nel.org,
	dmitry.torokhov@...il.com
Subject: [REGRESSION]: hibernate/sleep regression w/ bisection

Hi.

Hibernate/sleep (echo disk/mem > /sys/power/state) has presented problems
for me starting with 2.6.39. Kernel 2.6.37.6 was the last completely bug-free
version I used (I skipped the 2.6.38 branch entirely).

The symptoms are that upon resume (from sleep/hibernate) there is no video
nor any keyboard input with the exception of sysrq.

It has been a frustrating bug to hunt down because it is not easily
reproduced; sometimes the bug doesn't pop up until after a long sequence of
hibernate/sleep cycles.

I successfully bisected the problem to: 8ee294cd9def000.

=======
Commit: 8ee294cd9def0004887da7f44b80563493b0a097
Author: Dmitry Torokhov <dmitry.torokhov@...il.com>
Date:   Mon Nov 15 01:39:57 2010 -0800
Input: serio - convert to common workqueue instead of a thread
=======

Backing out 8ee294cd9def000 (which requires reversing part of
1d64b655dc083df also) fixes this particular problem on 2.6.39.4,
3.0.8, and 3.1.

Unfortunately, in 3.0.8 and 3.1 I have other suspend/hibernate problems
that I will investigate next and detail in a different regression report.

~ Andy

System specs: P4/Radeon GPU

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