Dear Eduardo, On 2020-03-01 06:46, Eduardo Ochs wrote: > I have two Debian 10 partitions on my laptop - a venerable ThinkPad > T400 with libreboot - and in one of these partitions (in /dev/sda5, > a.k.a. the "bad partition") sound doesn't work, and in the other one > (/dev/sda4, a.k.a. the "good partition" from here on) it does... > > The "bad partition" had Debian 9, and after I upgraded it to 10 with > "apt-get dist-upgrade" sound stopped working on it (details soon). I > then installed Debian 10 from a installation pen drive on an empty > partition to be able to test things on both; sound works on it > perfectly, so let's call it the "good partition". > > I've tried several sound debugging recipes that I found on the > internets and they didn't work, so I've decided to use this as an > excuse to learn more about sound on Linux. > > "Sound doesn't work" here means that all applications that play > sound - including speaker-test, that seems to be very low-level - > behave normally, but I can't hear anything - even when I use alsamixer > to set "Master", "Headphone", "Speaker", "PCM", "Beep" and "Internal" > all to the maximum level. […] > About pavucontrol: in the bad partition the only output device that > appears in the "Output Devices" tab is called "Dummy Output". This > looks like a red flag, but I got the impression - please confirm - > that PulseAudio runs on a level above ALSA, and problems with > PulseAudio should not affect the behavior of speaker-test. > > So: any hints? What should I add to my script to compare the behavior > of ALSA in the two partitions? Am I wrong in thinking that > speaker-test ignores PulseAudio? How do I examine the status of > PulseAudio without using the GUI? Are there ways to mute and unmute > the sound using the functions in /usr/share/alsa/utils.sh? What > else?... Please attach the output of `alsa-info.sh` [1] for the non-working and working case. Kind regards, Paul [1]: https://www.alsa-project.org/alsa-info.sh
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