Re: [linux-pm] intermittent suspend problem again

[Ferenc Wagner]

Ferenc Wagner <wferi@xxxxxxx> 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?  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?

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?
-- 
Thanks,
Feri.
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