http://bugzilla.kernel.org/show_bug.cgi?id=9518





------- Comment #2 from [EMAIL PROTECTED]  2007-12-08 12:34 -------
As mentioned in the bug description - the acpi sleep was the only method that
worked for us in 2.6.21. And is broken since...

As to a "regular" reboot(poweroff) syscall:
After a day of debugging I have established that the most logical source of the
"regular" poweroff issue is the snd_hda driver (95% sure).

I suspect that we are trying to bring down the system too quickly without using
PM suspend calls first (can sys_reboot(poweroff) function abort or lock if the
drivers were not run through PM_suspend routine?)

However this brings a question: what is the user interface to trigger a PM
suspend call in the system? Normally it is done by hibernation driver, but here
I do not want to go through freezing all tasks and writing the PCI state - just
power down...
I have started using an ugly workaround - rmmod'ing all drivers in a loop - and
that seems to help...


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