Peter F. Patel-Schneider wrote:
> I just installed powertop 1.11 on a Thinkpad T60p under Fedora 10.
>
> I'm now getting the following amusing message from powertop:
>
> A USB device is active 0.0% of the time:
> USB device 5-1 : BCM2045B (Broadcom Corp)
>
> Q - Quit R - Refresh U - Enable USB suspend
>
> I have the bluetooth device turned off using the IBM ACPI interface.
hmm
this particular tip got added in 1.10, and it signifies that the device is
actually in use a significant amount, except that it's actually less than 0.1%
(which is still a lot of course).
you can verify this by looking at the output of this command:
watch -d 'grep . /sys/devices/*/*/usb*/power/*_duration'
you should be able to see how much it's busy by changing this:
- sprintf(usb_hint, _("A USB device is active %4.1f%% of the time:\n%s"
+ sprintf(usb_hint, _("A USB device is active %4.4f%% of the time:\n%s"
in urbnum.c (for instance).
Can you see how much (for the device mentioned) "connected_duration" grows in
relation to "active_duration" ? I think there might be something weird
happening,
such as the device being connected less than active, which would screw up the
calculation, as well as being bogus in the first place.
Auke
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