Am Donnerstag, den 16.02.2012, 10:14 +0100 schrieb Paul Menzel: > Am Mittwoch, den 15.02.2012, 01:38 -0800 schrieb j: > > On 02/15/2012 01:31 AM, Paul Menzel wrote: > > > Am Sonntag, den 12.02.2012, 00:22 +0100 schrieb Paul Menzel: > > >> Am Freitag, den 10.02.2012, 06:08 -0800 schrieb Arjan van de Ven: > > >>> 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 > > >> That was also to no avail. > > >> > > >>>>>> 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. > > >> Thank you very much for that information. I brought that problem up to > > >> the alsa-devel list [1]. > > > According to Takashi Iwai this is a known missing feature nobody has yet > > > implemented. To get the power management enabled the audio device has to > > > be opened by for example `echo -n | aplay`. > > > > > > Unfortunately I do not have any numbers how much "wasted" power we are > > > talking about here. > > > >> [1] > > >> http://mailman.alsa-project.org/pipermail/alsa-devel/2012-February/049019.html > > > [2] > > > http://mailman.alsa-project.org/pipermail/alsa-devel/2012-February/049095.html > > Am Mittwoch, den 15.02.2012, 01:36 -0800 schrieb j: > > I see the same in my powertop2 results and have been searching for ways > > to cut it down as it seems to be the only thing really that while lists > > not actual wattage being drawn stays at a constant 100%. If there is any > > useful info I can pass along let me know. > > > > Thanks for all the great work on the powertop project > > > Sorry forgot to post it says its Audio codec hwC0D0: Conextant. When not > > power saving (on ac) runs about 426mW 100% usage no results return with > > the listed commands requested before. When I apply my battery power > > savings nothing in mW but still stays at 100% usage > > Please post the output of the `/sys/*` files I also posted. > > $ > more /sys/module/snd_hda_intel/parameters/power_save_controller > $ more /sys/module/snd_hda_intel/parameters/power_save > > And the following in the beginning with some pause in between. > > $ > /sys/devices/pci0000.00/0000:00:…/sound/card0/hwC0D0/power_{on,off}_acct > > Then `echo -n | aplay` and the above again. > > $ > /sys/devices/pci0000.00/0000:00:…/sound/card0/hwC0D0/power_{on,off}_acct > > Then `aplay some_wave_file.wav`. > > $ > /sys/devices/pci0000.00/0000:00:…/sound/card0/hwC0D0/power_{on,off}_acct > > Then play some music using your favorite music player (MPlayer, Totem, …). > > $ > /sys/devices/pci0000.00/0000:00:…/sound/card0/hwC0D0/power_{on,off}_acct
j, did that work for you? > PS: To keep threading, please also answer to your messages if you add > something. If you do not get messages sent by you delivered to you again > you can go to your sent folder and answer to the message their. Also > please only send plain text messages which you already did in your later > messages. [3] Thanks for that! Thanks, Paul > [3] http://en.opensuse.org/openSUSE:Mailing_list_netiquette
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