Re: [linux-pm] Resume hangs [was: mmotm 2010-12-02-16-34 uploaded]

[Jiri Slaby <jirislaby@gmail.com>]

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.

regards,
-- 
js