https://bugzilla.kernel.org/show_bug.cgi?id=51151


Aaron Lu <[email protected]> changed:

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         AssignedTo|[email protected]          |[email protected].
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--- Comment #8 from Aaron Lu <[email protected]>  2013-02-01 01:58:12 ---
(In reply to comment #7)
> And also correct that screen will be black after restarting IF I WILL do
> suspend.

Yes I know.

> So it still seems to be ACPI problem too (suspect, that powering up of
> videocard after restarting isn't correct because last wake-up after suspend 
> did
> something wrong).

While suspend/resume does not involve ACPI only :-)
During suspend/resume, individual driver will need to take care of the devices
it drives to suspend them and then resume them. If the system can not wakeup
from a suspended state, it probably is a ACPI problem. But if after resume,
some device does not behave well, it is the driver's problem.

If possible, you can try the debug method described here:
https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt

In short, you can do:
# echo devices > /sys/power/pm_test
# echo disk > state
This will make devices go through suspend/resume cycle without involving ACPI,
and then you can reboot to see if screen works.

Thanks,
Aaron

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