** Summary changed:
- Powertop make wrong suggest to add usbcore.autosuspend=1
+ Powertop make wrong suggestion to add usbcore.autosuspend=1
** Description changed:
Binary package hint: powertop
- Powertop make wrong suggestion to enable "usbcore autosuspend=1" if it find
device set to autosuspedn=0.
+ Powertop makes wrong suggestion to enable "usbcore autosuspend=1" if it finds
device set to autosuspend=0.
According to documentation of "Power Management for USB" (, Alan Stern
<[EMAIL PROTECTED]>, October 5, 2007. )
kernel, up version 2.6.22, use 0 for "autosuspend as soon as the device
becomes idle" but -1 means never to autosuspend.
......
The user interface for dynamic PM
.....
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.)
Regards,
Alex
--
Powertop make wrong suggestion to add usbcore.autosuspend=1
https://bugs.launchpad.net/bugs/136549
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