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    SubjectRe: Fan runs full speed after S3 sometimes (regression)
    On 08/20/2010 08:31 AM, Pavel Machek wrote:
    > On Tue 2010-08-10 20:39:44, Jiri Slaby wrote:
    >> On 08/10/2010 01:20 PM, Jiri Slaby wrote:
    >>> Hi,
    >>>
    >>> till I was running on 2.6.34-rc5-mm1 (mmotm) and earlier everything was
    >>> fine. Now, I'm running 2.6.35-rc6-mm1 (.35-rc5-mm1 was the same) and
    >>> sometimes when the computer (desktop) returns from S3, the CPU fan is
    >>> running at full speed making a big noise.
    >>
    >> Just to add, full power cycle is needed to get rid of that. Warm reboot
    >> is not enough.
    >
    > Seems like bios problem... Update bios?

    I don't think so, it had been working for more than 2 years before this
    issue appeared.

    >>> I don't know how to debug that. Bisection is out of question -- it
    >>> happens once in 10 or 20 cases. There are no fan entries in /sys.
    >
    > Well, doing 20 suspends in a row from a script should not be too bad.

    20 is just a guess. I haven't seen it for pretty few days until the day
    before yesterday. And it looks like CPU1 is brought up a half way. When
    the fan was at full speed I tried:
    echo 0 > /sys/devices/system/cpu/cpu1/online
    and whole system freezed. Otherwise this commands succeeds.

    I'll load a crash kernel prior turning the CPU off next time.

    thanks,
    --
    js


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