Bug 42758

Summary: No sound after upgrade from kernel 3.1 -> 3.2
Product: Drivers Reporter: Hans (hans.ullrich)
Component: Sound(OSS)Assignee: drivers_sound
Status: RESOLVED INVALID    
Severity: normal CC: alan, tiwai
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 3.2.4 Subsystem:
Regression: No Bisected commit-id:
Attachments: output of alsa-info.sh

Description Hans 2012-02-12 09:00:01 UTC 
Dear kernel-team members,

I upgraded my debian-amd/testing from kernel 3.1 to 3.2. (stock kernel). After upgrade I dicovered, I am getting no sound output. 

In CLI I can see, that the soundfile is playing, but there is no output. 

Reverting to the former kernel let me play sound again, so it is confirmed, that it is a kernel problem. 

Below I have attached a zip-file. It contents the output of alsa-info.sh. The one "-with-sound" is made with kernel 3.1, the one "-no-sound" is made with kernel 3.2.

Hope this helps. 

Best regards

Hans-J. Ullrich
Comment 1 Hans 2012-02-12 09:01:28 UTC 
Created attachment 72356 [details]
output of alsa-info.sh
Comment 2 Takashi Iwai 2012-02-12 11:51:15 UTC 
Both Headphone and Speaker volumes are set to almost zero.  Try to raise these.
    % amixer -c0 set Speaker 0dB
    % amixer -c0 set Headphone 0dB
    % amixer -c0 set Master -12dB
Comment 3 Hans 2012-02-13 18:37:42 UTC 
Hi Takashi, 

they are risen to full height! I checked this before(!) with kmixer and 
alsamixer, too. Maybe, this is the main problem? I mean, that they are risen, 
but the module does not take this.

Hans
Comment 4 Takashi Iwai 2012-02-13 19:05:23 UTC 
Do you mean kmixer and alsamixer show these as full although these aren't in raw values?  It's odd.  Please double-check with "alsamixer -c0".  Without -c0, it'd be routed forcibly through PulseAudio and shows only Master volume.

And changing the values like in comment 2 actually fixes your problem?
Comment 5 Hans 2012-02-13 19:19:09 UTC 
Hi Takashi, 

thank you for your help. Due to your questions I found the reason! I started alsamixer as you suggested, and I got an additional slider called "speaker". This one was set indeed to 0. I raised it and voila - got sound again.

I checked it in my GUI of kmixer, and there it was missing, too. As I never used the slider for "speaker" all the time (just "master" and "pcm"), I forgot about it. An the new kernel semmed to set this one to 0 by default. 

So it was PEBKAC, but without your help, I would have never found it! So thank you very, very much for your time! I am very happy again.

You can safely close this bugreport.


Have a nice day!

Best greetz

Hans