Messages in this thread | | | Date | Mon, 16 Mar 2015 14:46:28 +0100 | From | Takashi Iwai <> | Subject | Re: 4.0-rc3: sound broken in chromium but not in mpg123 |
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At Mon, 16 Mar 2015 13:37:19 +0100, Pavel Machek wrote: > > On Sun 2015-03-15 09:23:15, Takashi Iwai wrote: > > At Sun, 15 Mar 2015 09:15:44 +0100, > > Pavel Machek wrote: > > > > > > On Sun 2015-03-15 09:12:47, Takashi Iwai wrote: > > > > At Sat, 14 Mar 2015 21:11:09 +0100, > > > > Pavel Machek wrote: > > > > > > > > > > Hi! > > > > > > > > > > Intel desktop machine: > > > > > > > > > > 00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High > > > > > Definition Audio Controller (rev 01) > > > > > > > > > > Sound worked ok in both in previous kernel versions. > > > > > > > > > > Any ideas? > > > > > > > > How broken? Did you get any error messages? > > > > > > I get some funny, faint, rhytmic noises where audio should > > > be... Actually, I somehow suspect something is wrong with time during > > > video playback. > > > > Did you try audio playback without video on chromium? > > Yes. Does not work, either; I tried > http://www.thenakedscientists.com/HTML/podcasts/ . > > > > > If the behavior depends on the application (e.g. ALSA vs OSS), I'd > > > > suspect rather a device permission problem at first. There are no > > > > significant changes between 3.19 and 4.0-rc3 regarding HD-audio. > > > > > > My system contains pulseaudio, so it is more complex than ALSA vs OSS > > > :-(. > > > > OK, that was missing information :) > > Then there should be any difference in the kernel driver side -- it's > > only a single PA process who accesses the sound device in the very > > same manner no matter what clients are used (after all it's the > > purpose of PA). > > > > Audio seems to work ok on thinkpad x60 with very very similar config. > > > > OK, then another thing I would check is to try different sample rates > > (e.g. via playing WAV files over PA). > > Like this? > > pavel@amd:/usr/share$ pacat ./sounds/alsa/Front_Right.wav > pavel@amd:/usr/share$ pacat --rate=48000 ./sounds/alsa/Front_Right.wav > pavel@amd:/usr/share$ pacat --rate=44100 ./sounds/alsa/Front_Right.wav > pavel@amd:/usr/share$ pacat --rate=32000 ./sounds/alsa/Front_Right.wav > pavel@amd:/usr/share$ pacat --rate=16000 ./sounds/alsa/Front_Right.wav > pavel@amd:/usr/share$ pacat --rate=8000 ./sounds/alsa/Front_Right.wav > > This seems to have behaved as expected.
Hmm. You might see a difference when comparing /proc/asound/card*/pcm0p/sub0/* files between working and broken cases (while playing something).
Other than that, I have no idea. A bisection would be needed, I'm afraid.
Takashi
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