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    SubjectRe: [REGRESSION]: hibernate/sleep regression w/ bisection
    On Tue, Nov 01, 2011 at 07:48:19AM -0500, Andrew Watts wrote:
    > 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@gmail.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.

    Does the following patch fix the problem?

    Thanks.

    diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
    index ba70058..95aeebd 100644
    --- a/drivers/input/serio/serio.c
    +++ b/drivers/input/serio/serio.c
    @@ -949,6 +949,7 @@ static int serio_resume(struct device *dev)
    * deal with it.
    */
    serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT);
    + queue_work(system_long_wq, &serio_event_work);

    return 0;
    }

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