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    SubjectRe: Resume from S2R fails after dpm_resume()
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    Hi.

    On Fri, 2007-03-02 at 07:25 -0700, Tim Gardner wrote:
    > Pavel Machek wrote:
    > > Hi!
    > >
    > >> I instrumented 2.6.21-rc1 base/power/resume.c device_resume() with
    > >> TRACE_RESUME(0) as the last statement in the function. Sure enough it
    > >> was the last hash value in the RTC after a hard reboot when resume failed:
    > >>
    > >> [ 12.028820] hash matches drivers/base/power/resume.c:104
    > >>
    > >> The machine appears to be absolutely wedged after initiating resume by
    > >> pressing the power button. The disk flashes for a half second or so,
    > >> then thats it.
    > >>
    > >> It is a Dell XPS, BIOS rev A04. I'm using 'echo 1 > /sys/power/pm_trace;
    > >> echo mem > /sys/power/state' to initiate the S2R sequence.
    > >>
    > >> Any suggestions on where to go from here?
    > >
    > > Did it work ok in 2.6.20? Can you try to get video working/get serial
    > > console/something?
    > > Pavel
    >
    > Pavel,
    >
    > The last version that worked well was Ubuntu Edgy (2.6.17). It was
    > broken by 2.6.18. I have not started the 'git bisect' process, instead
    > I've been trying to figure out why it doesn't work in 2.6.21-rc2. Using
    > the TRACE_RESUME macro I've drilled down to
    > kernel/printk.c:__call_console_drivers. So far the last trace info that
    > I have is just before the call to con->write(). I'm trying to figure out
    > what driver has registered as the console (intel_agp or agpgart?).
    >
    > Am I banging my head on a known problem?

    Tim, it's possible that the problem you're seeing is completely
    different to the one Pavel is looking for. Given that you're down to
    looking in console write code, I wonder if it's related to the changes
    to console suspending that were done around that time. I'd suggest
    either looking in LKML or Linux-PM archives for a commit related to
    suspending the console, or doing your git bisect.

    Regards,

    Nigel

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