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Hi Arjan!
i have two issue with powertop:
1. powertop check if usbcore autosuspen is enabled by checking /sys/bus/usb
interface. but will make wrong suggestion if one of devices is
blacklisted
for example this i get on my system:
- --------------------------------------------------------
cat /sys/bus/usb/devices/*/power/autosuspend
- -1 <== blacklisted scanner
2
2
2
2
2
- ----------------------------------------------------------------
2. _really_important_ . latest powertop use old usb kernel API, this not
working with new API:
Documentation/usb/power-management.txt
- ---------------------------------->8---------------------------------
power/autosuspend
This file contains an integer value, which is the
number of seconds the device should remain idle before
the kernel will autosuspend it (the idle-delay time).
The default is 2. _0_ means _to_autosuspend_ as soon as
the device becomes idle, and _-1_ means _never_to
autosuspend_. You can write a number to the file to
change the autosuspend idle-delay time.
Writing "-1" to power/autosuspend and writing "on" to power/level do
essentially the same thing -- they both prevent the device from being
autosuspended. Yes, this is a redundancy in the API.
(In 2.6.21 writing "0" to power/autosuspend would prevent the device
from being autosuspended; the behavior was changed in 2.6.22. The
power/autosuspend attribute did not exist prior to 2.6.21, and the
power/level attribute did not exist prior to 2.6.22.)
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