I've done some more tests and collected a lot of data. And I found a workaround for the problem: adding "position_fix=1" reactivates the mic! Now I have sound and a working mic! However, there are some downsides: First of all, the recording quality is much lower than within the live session. I need to set the volume of the capture device to max to be able to recognize my own voice, but that introduces a lot of noise to the recorded stream. Within a live session, the recorded stream is much louder, it is usable even with the capture device almost muted! I totally don't understand how this can happen... Secondly, I still consider it a bug when something works within the live system and stops working after installation! This is kind of a "sound-lottery" and would easily become a show-stopper for less experienced users. To find the reason for the bug, I collected data from different settings and compared them, without a result. However, I'm not an ALSA developer, so I decided to attach all collected information hoping that it will be helpful. These are the files inside the archive: alsa-info-live.txt : information collected from the alsa-info script within the live session (everything worked perfectly) alsa-info-installed.txt : info collected after installation, with no additional options (nothing worked, 1 out of 10 times the sound worked) alsa-info-probe.txt : dito, but with 'probe_mask=8' (sound works, mic is dead) alsa-info-pos.txt : dito, but with 'position_fix=1' (sound and mic work, but low quality) I don't know for how long I'll have access to this machine, but as long as I do, I can carry out additional tests and collect more data if necc. Cheers JK 2009/9/24 <remrot@xxxxxxxxx> > /* Sorry for posting this to the devel list, but the problem seems to be > trickier than I first thought * > * and I don't have much time left to fix it (not my machine)! Thanks... > */ > > Hi! > > I've got a very strange problem with a ALC861 soundchip on a friend's > Toshiba A100-507 Laptop. Sound output and input work perfectly within a live > session using the Ubuntu Jaunty and Karmic (Alpha6) CDs but immediately > stops working after installing the system. Currently I've installed the > latest Karmic containing kernel 2.6.31 and ALSA 1.0.20. I've attached the > output of the alsa-info script as well as the output of 'pacmd list' for > both systems (live and installed). > > Right after the installation the sound stopped working and I couldn't > record anything. Alsamixer showed only output devices, no capture devices at > all (everything has been correct within the live session). In 'dmesg' I > found the following error messages: > > [ 279.924019] hda-intel: azx_get_response timeout, switching to polling > mode: last cmd=0x301f000a > [ 280.928019] hda_intel: azx_get_response timeout, switching to single_cmd > mode: last cmd=0x301f000a > > After doing some research I found this guide (thx Mr. Iwai): > > http://www.kernel.org/pub/linux/kernel/people/tiwai/docs/HD-Audio.html#_codec_probing_problem > > And indeed, adding 'probe_mask=8' fixed the sound output and brought back > the capture devices (remember that they were there within the live session > without that option). I've also tried the 'model=toshiba' option (combined > with > 'probe_mask' and standalone) but that didn't help at all (no capture > devices and no sound). > > The current situation: > > I've already posted to the PulseAudio mailing ist and got some help from > Mr. Colin Guthrie but we haven't found a solution (everything seems OK > regarding PA). I still can't record anything within the installed system. I > tried audacity, alsarec and the gnome-sound-recorder without luck. When > recording in audacity, the timeline cursor doesn't move, it only flickers. > In gnome-recorder, recording stops right after it has started and the > application hangs on exit. PA's volume meter doesn't show anything either, > it is empty. I compared the configurations on both systems but I see no > differences that are not related to the 'probe_mask' option... I really > believe that there is a solution because everything works in a live session. > Can anybody help me with this? > > Regards > > JK
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