Ubuntu
powertop package

  1. Bug #136549
  2. Comment #22

Comment 22 for bug 136549

Revision history for this message
schmolch (saschaheid) wrote : Re: Powertop make wrong suggest to add usbcore.autosuspend=1

powertop (from svn) tells me that my CPU is stuck in C2 70% of the time until
- i enable usb-autosuspend with powertop
- or remove uhci_hcd myself.
after which C2 drops to zero.

At the same time cat /sys/bus/usb/devices/*/power/level reports AUTO for all values.
No usb-devices are used except for a internal fingerprint reader which is not set up (no modules loaded).
Kernel is 2.6.22-14-generic from Gutsy.

Can anyone explain this please?