Greg KH wrote:
I do: echo "mem" > /sys/power/state and it trys to go to sleep until it hits the hcd driver which prevents it, so it backs out of the sleep process.
Prevents it how ... if you enable debugging, it must say something.
When I tried that with "standby" on a few systems, it broke horribly (system lockup, no resume) even without an HCD loaded. That, plus the fact that until recently "apm -s" generally oopsed on resume, has made me rather distrustful of the PM code in 2.6 kernels. Though it works for some folk, I'm told.
If I unload the module(s) I can successfully sleep just fine. Another person has also reported this to me, so I know I'm not alone.
I certainly used sysfs to change the device power state ... so it should work otherwise.
How did you do this?
Suspend to D3 by:
echo -n 3 > /sys/class/usb_host/$BUSNAME/device/power/state
Resume to D0 by:
echo -n 0 > /sys/class/usb_host/$BUSNAME/device/power/state
Last I tested, all three HCDs would behave with such cycles.
- Dave
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