"Rafael J. Wysocki" <rjw@xxxxxxx> writes:
> On Wednesday 18 November 2009, Ferenc Wagner wrote:
>> 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?
>
> 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).
I've been running with CONFIG_PM_VERBOSE=y for a good while, but that
didn't help getting for example the result of the following printks to
the VGA console (0x3bc is the parallel port):
@@ -445,34 +446,66 @@ int hibernation_platform_enter(void)
* hibernation_ops->finish() before saving the image, so we should let
* the firmware know that we're going to enter the sleep state after all
*/
+ printk ("hibernation_ops->begin()...\n");
+ outb(16, 0x3bc);
error = hibernation_ops->begin();
+ outb(17, 0x3bc);
+ printk ("hibernation_ops->begin(): %d\n", error);
if (error)
goto Close;
However, my dmesg is full of lines like
agpgart-intel 0000:00:00.0: preparing freeze
pci 0000:00:00.1: preparing freeze
pci 0000:00:00.3: preparing freeze
etc., I'll check it they are the same all the time. Anyway, the above
printk strings aren't present in dmesg after a successful resume even,
so I must be doing something wrong... The parport pins do change, though.
Maybe explicit levels would work better? I can't see any other
difference from the pm_dev_dbg macro producing the above lines.
>> 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 for the tip, I'll check this too.
--
Regards,
Feri.
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