Hi all,
I have two Debian 10 partitions in my laptop, one that was a Debian 9
that I "apt-get dist-upgrade"d to Debian 10, and one in which Debian
10 was installed from scratch using an installation pen drive...
In the "dist-upgrade"d partition sound doesn't work and in the other
one it does, so let me call them the "bad partition" and the "good
partition".
I was guessing that the problem was in ALSA, and to test that I wrote
the script below, ran it in both partitions, and compared their
outputs:
logthis () { echo $*:; eval $* 2>&1; echo; echo; }
{
# Debian version
logthis cat /etc/issue
logthis cat /etc/debian_version
logthis cat /etc/os-release
logthis lsb_release -da
logthis hostnamectl
# List devices and PCMs
logthis aplay -l
logthis aplay -L
# Drivers and modules
logthis "lspci -vvv | grep -A8 Audio"
logthis "lspci -knn | grep -A2 Audio"
# Permissions
logthis groups
logthis ls -lAF /proc/asound/
# This partition
logthis "mount | grep 'on / '"
# ALSA state
logthis "rm -f /tmp/o; /usr/sbin/alsactl -f /tmp/o store; cat /tmp/o"
} | tee ~/oalsa
then I sent a long e-mail to the ALSA mailing list - this one:
https://www.mail-archive.com/alsa-user@xxxxxxxxxxxxxxxxxxxxx/msg32698.html
I got two answers. This one, by Kaj Persson, about MANY other sound
bugs in a dist-upgraded Debian 10,
https://www.mail-archive.com/alsa-user@xxxxxxxxxxxxxxxxxxxxx/msg32699.html
and another one, very brief, in private - and possibly sent from a
cell phone -, from Patrick May, saying that he thinks that "aplay -l"
gives me "Subdevices: 0/1" in the bad partition and "Subdevices: 1/1"
in the good partition because something - possibly pulseaudio - is
using one of the subdevices, and that I should try "pulseaudio
--kill"...
I tried to test Patrick's suggestion, but I found that when I kill a
pulseaudio process systemd starts a new one, and I spent about two
hours trying to find a clean way to kill pulseaudio without systemd
restarting it... I couldn't find a way, and the details overwhelmed
me, and my brain overheated! Sorry!... =(
If several people are having problems with sound on dist-upgraded
Debian 10s - note that "several" at this moment means "at least two"!
- then I think that it would be great to have a much bigger version of
the script above that would also make pulseaudio report lots of things
about its status. I can start working on that bigger script, but:
1) *** ALL HINTS AND SUGGESTIONS ARE WELCOME ***,
2) again: how do I kill pulseaudio? The most urgent thing now is to
add a block like this to the script:
logthis my-kill-pulseaudio
logthis aplay -l
logthis my-restart-pulseaudio
Thanks in advance!
Eduardo Ochs
http://angg.twu.net/
http://angg.twu.net/emacsconf2019.html
(^ on "executable notes")
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