-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 W dniu 2015-10-05 o 01:27, Tanu Kaskinen pisze: > On Sun, 2015-10-04 at 20:28 +0200, Mikhail Morfikov wrote: >> In the case of snd_hda_intel kernel module, there's two options called >> power_save and power_save_controller . I've set them to the following >> values: >> >> # systool -v -m snd_hda_intel | grep power >> power_save = "10" >> power_save_controller= "Y" >> >> According to archlinux wiki (https://wiki.archlinux.org/index.php/Power_management#Audio), >> the power_save parameter is measured in seconds, and it should idle the >> audio card after 10s. >> >> The question is how could I know whether this works or not? Is there >> any way to be sure that the powersave mode was activated? I've heard >> that there's could be some "clicking" when the state of the sound >> card changes, but I don't hear anything. Some people reported that the >> volume behaves really strange, but it seems that it works just fine on >> my machine. >> >> Does the powersave mode in the kernel module is somehow related to the >> following output? >> >> $ pacmd list-sinks | egrep -i "state|suspend" >> state: SUSPENDED >> suspend cause: IDLE >> >> I noticed that when some app plays audio stream, the state becomes >> RUNNING. When the app stops playing, the state changes to IDLE, and >> about 5s later, it changes to the state that you can see above. This >> behavior is the same no matter what I set in the power_save option >> in the kernel module. I've tested 0, 1 and 10, and actually I didn't >> notice any difference. >> >> So, is the powersave mode enabled or not? > > I'm not familiar with the kenel module, so I can't answer most of your > questions. However, I can tell you that the PulseAudio sink state (IDLE > or SUSPENDED) is not the same thing as the kernel driver's power save > state. Based on your description, the driver enters the power save mode > 10 seconds after the PulseAudio sink state has changed to SUSPENDED > (suspending means that PulseAudio closes the alsa device). > So it should work. Though I have no idea how to check the state of the soundcard. -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJWEfq/AAoJEM0EaBB3G2UgQKwP/08KpDWVbsrI4MbCD5k/qffP C/0O5VzkHcGvUvaQ0Ssldc2z54f9ItvIbpvLydnGuQBq+Yfa30nlv9xCajwSdXo4 psepyvQ1bC9kL4AKQen3vitxtU5KbWfIFZVljfxnaBzP4WUgh2elO8Gdge9G118Y ggO+/vDSvdT88WHyt17GyUF8oWS6eKlvdgfA8+jDqQHcbHlTse2DWZrFkuDegoZb DtFxBI54YIK81k+Tup3HN11F4O442s4AXq3hB1BVQx91SqfMU7E9T0kSas/XJf/0 UVAaTmKLNbqTHK5UjTTDvQP6rBMmy4FNJRsFtKeUsNq09nzj+NkBKb97H5LgXtC2 7+4fbJ14Z+NAXe3D0J2qnf3ByJQ+PZetU+W0goufv/XAOFR100L75STpma3pY3dl qHIwm4jkLCWe7yBu3hgoVIcZ79TnmqAV0r5x6qlcCfAQ9WzBB8xvnSChtkYHfxt9 AD6zqQc7qPFHx2je8CcWtUhJbLC0lL3clt4Vju2mi3CGNJE1vC7BClWcFgQjHpfP CXLw/NdGLZLS74tZrSSP+DFrqaPo/1K68HY96fiXmSrC8lhSPR3jULk+tJQRo28b gONGvnqOx7wt7i0f9SXKADg+W7sLZssDVAEaXZyB9WnGvP1mNe8GjWLSdCEFAtGO yvyta4TkiSmqYVBEOprT =1cyP -----END PGP SIGNATURE-----
