On 2/10/2012 1:07 AM, Paul Menzel wrote: > Unfortunately neither `lsof` nor `fuser` returned any process using that > device. > > $ sudo lsof /dev/snd/hwC0D0 > $ sudo fuser -v /dev/snd/hwC0D0
also look for /dev/dsp or similar > >> > or you found a real kernel driver bug ;-) > Looks like it. I guess I will contact the ALSA list and asking what this > device is about and if they can fix it. > > Could you answer a last question, please? What is PowerTOP actually > checking to figure out the usage. the codec's directory in sysfs (say /sys/devices/pci0000.00/0000:00:1b.0/sound/card0/hwC0D3) has 2 files, power_on_acct and power_off_act these count time that the codec is on or off respectively. powertop calculates a delta of these two over the measurement interval (20 seconds), and then since it knows how long it was on and off, calculates the percentage. _______________________________________________ Discuss mailing list [email protected] http://lists.lesswatts.org/listinfo/discuss
