Alan, Oliver,
On Sun, Apr 04, 2010 at 07:42:33PM +0200, Dominik Brodowski wrote:
> Oliver,
>
> Unfortunately, autosuspend of btusb does not seem to work on my notebook
> with 2.6.34-rc3:
Debugging this a bit further (that's what long train rides are for):
1) btusb_open() gets called, which contains a pair of
usb_autopm_get_interface(), usb_autopm_put_interface() calls. It
sets needs_remote_wakeup = 1; in between there are two calls to
usb_mark_last_busy().
2) There follow a few usb_mark_last_busy() calls.
3) Then, btusb_close() gets called, which again contains a pair of
usb_autopm_{get,put}_interface() calls. Once btusb_close() returns,
atomic_read(&intf->dev.power.usage_count) returns 0.
This means that after startup, this usage_count is 0. Nonetheless,
btusb's suspend callback is never called, despite the following settings:
# cat /sys/module/usbcore/parameters/autosuspend
2
# cat /sys/bus/usb/devices/7-1/power/level
auto
Best,
Dominik
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