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    SubjectRe: [RFC][PATCH 0/3] PM: Asynchronous suspend and resume
    On Fri, 14 Aug 2009, Rafael J. Wysocki wrote:

    > On Friday 14 August 2009, Alan Stern wrote:
    > > On Thu, 13 Aug 2009, Rafael J. Wysocki wrote:
    > >
    > > > > No, I've only tested it with a few selected drivers. I'm going to try the
    > > > > "async everyone" scenario, though.
    > > >
    > > > On HP nx6325 booted with init=/bin/bash it doesn't pass the
    > > > 'echo devices > /sys/power/pm_test && echo mem > /sys/power/state' test.
    > > >
    > > > The suspend part actually seems to work, but the resume part crashes
    > > > miserably.
    > >
    > > Any details? Can you tell where it crashes?
    > Unfortunately it ends up in a continuous flood of backtraces, so I can't
    > say much.

    Same sort of thing happened with me, but it appeared to happen during
    suspend. (I say "appeared" because the system froze for a while at the
    start of the suspend until I hit a key. This may be related to all the
    recent churn in the TTY layer, combined with the fact that I was using
    a serial console. It didn't help -- none of the backtraces got sent
    out the serial port.)

    > However, if I set async_suspend for all PCI devices, as well as for ACPI battery
    > and i8042, everything apparently works, even with real suspend-resume.

    I think it would be worthwhile to track down these unknown problems and
    dependencies. It won't be easy, though...

    Alan Stern

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