Re: S4 hang with uvcvideo causing "Unlink after no-IRQ? Controller is probably using the wrong IRQ."

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On Sat, 7 Mar 2009, Brandon Philips wrote:

> > Have you tried suspending just the two devices plugged into that EHCI 
> > controller instead of suspending the entire system?  That would make it 
> > a lot easier to carry out testing.
> 
> I tried to reproduce with s2ram suspend, echo suspend >
> /sys/bus/usb/devices/.../power/level and /sys/power/pm_test levels but none of
> them reproduced it. So, at this point the only way I can reproduce this is with
> a full S4.

That's a little misleading.  Unless I misunderstood your log, the hang 
occurred _before_ your system entered S4.  In fact, it occurred before 
the memory image was written out to the disk.

> Is there some other method I missed of testing?

How about echo disk >/sys/power/state with various settings in 
/sys/power/disk?

Alan Stern

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