Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [linux-pm] intermittent suspend problem again | Date | Wed, 18 Nov 2009 23:13:14 +0100 |
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On Wednesday 18 November 2009, Ferenc Wagner wrote: > Ferenc Wagner <wferi@niif.hu> writes: > > > Since I've instrumented s2disk and the hibernation path, no freeze > > happened during hibernating the machine. > > Not until I removed the delays from hibernation_platform_enter(), which > were put there previously to get step-by-step feedback. Removing them > again resulted in a freeze in short course, maybe just two hibernations > later. The instrumentation shows it stuck in dpm_suspend_start(PMSG_HIBERNATE). > Does it mean that some device driver is at fault?
A driver or one of the platform hooks.
> I'll check if it always fails at the same point (although tracing into > dpm_suspend_start isn't pure fun because of the multitude of devices it > loops over). Is there any way to get printk output from that phase?
Compile with CONFIG_PM_VERBOSE (it does mean exactly that).
> Side question: If I run s2disk from the init=/bin/bash prompt, the > instrumentation in acpi_enter_sleep_state_prep in drivers/acpi/acpica/hwsleep.c > fires before the "Snapshotting system" phase, but it does not fire if I > hibernate from the full running desktop. (That instrumentation was put > there to investigate the KMS-triggered STR freeze.) What could explain > this?
It looks like it uses the "shutdown" method when run with init=/bin/bash, but I don't know why exactly.
Thanks, Rafael
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