On Tue, 22 Feb 2011, Jiri Slaby wrote:
> On 02/04/2011 08:33 PM, Alan Stern wrote:
> > On Fri, 4 Feb 2011, Jiri Slaby wrote:
> >
> >>>> It seems to suffice... No hangs still. Should I enable pm_async back
> >>>> again to confirm the issue is still present?
> >>>
> >>> Yes, please, it would be good to know for sure.
> >>
> >> Ok, confirmed right now :).
> >>
> >> I disabled pm_async for USB again. What do you suggest next?
> >
> > What happens if you leave pm_async enabled but unplug all the USB
> > devices before suspending? If there are any USB devices you can't
> > unplug, you can get an equivalent result by unconfiguring the root
> > hubs:
> >
> > for a in /sys/bus/usb/devices/usb* ; do
> > echo 0 >$a/bConfigurationValue
> > done
>
> This doesn't seem to help. The hang happened 3 times during the 2 weeks.
>
> I have /etc/pm/sleep.d/99usb-debug with:
> #!/bin/bash
>
> send() {
> for a in /sys/bus/usb/devices/usb* ; do
> echo $1 >$a/bConfigurationValue
> done
> }
>
> case "$1" in
> hibernate|suspend)
> send 0
> ;;
> thaw|resume)
> send 1
> ;;
> *)
> ;;
> esac
>
> exit 0
>
> And it indeed properly enable/disable usb before/after suspend.
Strange indeed. It's worth noting that the async stuff affects only
the normal suspend and resume operations, not the late-suspend and
early-resume operations. This means that it all likelihood, the system
crashes either before finishing the suspend or after doing a fair
amount of the resume. And yet that's not consistent with what you see
on the screen.
By the way, are you booting with no_console_suspend? And do you do
"echo 8 >/proc/sys/kernel/printk" (or equivalently, Alt-SysRq-8) before
suspending?
What about if you leave async enabled for all the USB devices _except_
usb[1-N]?
Alan Stern
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