sony-vaio-z-series team mailing list archive

[Jon Young <jon@xxxxxxxxxxxxxxxxxxxx>]

For some reason my usb devices aren't suspending properly killing my
battery life.  Any suggestions? vpcz12 kubuntu 12.04 ppa kernel 3.4.
Stock ubuntu kernel exhibits the same issue.

>From powertop:
The battery reports a discharge rate of 17.7 W

Summary: 568.6 wakeups/second,  0.0 GPU ops/second and 0.0 VFS ops/sec

Power est.      Usage       Events/s    Category       Description
  8.71 W    100.0%                      Device         USB device:
Fingerprint Sensor    (TouchStrip        )
  4.85 W    100.0%                      Device         Radio device: btusb
  1.91 W     71.4%                      Device         Display backlight
  1.60 W    100.0%                      Device         Display backlight

All tunables are set to good.

Thanks for any suggestions.


On Fri, May 11, 2012 at 1:19 AM, Danilo Šegan <danilo@xxxxxxxxx> wrote:
> У чет, 10. 05 2012. у 13:49 +0200, Danilo Šegan пише:
>> У чет, 05. 04 2012. у 13:45 +0200, Reinhard Oldenburg пише:
>> > Thanks for the two replies so far. They triggered me to install Bumblebee and swithcing to inteal graphivs with this  (and still the originl BIOS) I get power consumption of 13-15 W. This is not as low as others reported but acceptable (yielding 3h of time on battery). Maybe the i7-640M in my model is responsible for this.
>>
>> Screen brightness and bluetooth are the other big battery drainers for
>> me.  Without sony-laptop module by Norbert I can't easily change the
>> screen brightness.  Turning of bluetooth and 3g card (when not in use,
>> of course), cuts down on a few watts as well.
>
> And don't forget the fingerprint reader: you can get your USB devices to
> sleep with "powertop":
>
>  5.10 W    100,0%                      Device         Display backlight
>  3.00 W    100,0%                      Device         Radio device:
> iwlwifi
>  2.47 W    100,0%                      Device         USB device:
> Fingerprint S
>  1.27 W    100,0%                      Device         Radio device:
> btusb
>
> Cheers,
> Danilo
>
>
>
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