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    SubjectRe: [linux-pm] [RFC][PATCH 0/3] PM: Asynchronous suspend and resume
    Date
    On Friday 14 August 2009, Rafael J. Wysocki wrote:
    > On Friday 14 August 2009, Alan Stern wrote:
    > > 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...
    >
    > Agreed.

    One data point: I set async_syspend for all ACPI devices in addition to PCI
    devices and that broke things.

    Which isn't really strange given that PCI devices generally have ACPI
    counterparts linked to them that I guess should be suspended later.

    Thanks,
    Rafael


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