Thank you for following up.
I have managed to complete a commit bisect of the Ubuntu kernels and can
confirm that the first bad commit is
851cc40f47677174527a1decbd1074feacd15a93:
ALSA: hda: call runtime_allow() for all hda controllers
BugLink: https://bugs.launchpad.net/bugs/1876765
Last known working kernel: 5.4.0-33, next installable Ubuntu kernel
5.4.0-37 introduces the bug.
I have tested that saving "options snd_hda_intel power_save=0" to a file
under /etc/modprobe.d and rebooting to a kernel from -37 onwards is a
valid workaround.
Lines mentioning ALSA from
http://chang
Ignore my last comment about last known working kernel, I've rebooted to
5.4.0.40 and I still see this issue, will try and do more testing on
kernel versions to see if I can find where it changes, and will also
look into the power_save options.
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To add to #9, as well as the headphones being detected after running
alsa-info, I can confirm that they still work as expected after
detection.
As this may be a bug introduced by a kernel change, the current kernel
running is 5.4.0.42.45 (generic, x86_64), whereas the previous one I was
running wh
The output of cat /proc/asound/card1/codec#0 after running alsa-info
differs slightly to that included within the alsa-info log itself (in
#8):
26c335
< Converter: stream=0, channel=0
---
> Converter: stream=5, channel=0
38c347
< Converter: stream=0, channel=0
---
> Converter: stream=5, ch
After running alsa-info, it appears that the headphones were detected
and started to show in Settings GUI, also showing in the attached pacmd
list report.
** Attachment added: "pacmd list after alsa-info with headphones connected"
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1888
Then after the fresh boot, I connected the headphones, verified no
sound, then re-ran alsa-info which gave the following attached log.
** Attachment added: "alsa-info log with headphones plugged in"
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1888992/+attachment/5396230/+files/a
For reference, after a fresh boot without headphones plugged in on my
machine, the alsa-info command gives the attached output.
** Attachment added: "alsa-info log fresh boot with no headphones connected"
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1888992/+attachment/5396229/+f
And a log from after I use pavucontrol to manually enable the 17h audio
controller while the headphones are plugged in, and confirming that they
do work as they used to.
** Attachment added: "pacmd list after manual switch"
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1888992/+at
For comparison, a log from before I plug in the headphones (after a
fresh boot)
** Attachment added: "pacmd list after a fresh boot"
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1888992/+attachment/5396218/+files/pacmd_list_fresh_boot.log
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As requested - after a fresh boot, and plugging in headphones and
verifying that there is no sound from them.
** Attachment added: "pacmd list after plugging in headphones"
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1888992/+attachment/5396217/+files/pacmd_list_headphone_plugge
Public bug reported:
I boot my system without any sound devices plugged into any jacks;
checking Gnome settings Sound, Output Device is "Dummy Output" (no other
options available in drop-down list). I plug in headphones into the
front jack and play some audio, but do not hear any sound from the
he
Still a problem in 16.04 LTS - constantly burning 20% CPU on idle.
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Touch seeded packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/207135
Title:
pulseaudio uses too much CPU
Status in
I found that disabling AMD C1E support in BIOS mitigates this issue (and
also another problem I had with boot stalling without mouse/keyboard
input) - this bug may be a duplicate of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1012806.
The Phenom II X3 710 supports C1E power saving state,
Public bug reported:
Audio playback via ALSA (snd_intel_hda) & pulseaudio inevitably 'skips'
(repeats buffer content) intermittently a few times each hour, and
severely whenever the screen is blanked for inactivity.
CPU load is low (mostly idle).
I didn't have this problem with my previous fresh
OK - I'll chalk this one up to the timer issue I mentioned.
Taking out "nolapic_timer" from grub options has allowed pulseaudio to
detect and use high precision timers and it has performed much better
(lower CPU usage, concurrent streams OK) - I still get the occasional
audio glitch, but I'll deal
Verbose log from pulseaudio
** Attachment added: "Output of pulseaudio -"
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1533783/+attachment/4549431/+files/pulseaudio_debug.log
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Touch seeded packages, whic
Public bug reported:
While playing a youtube video, starting up another audio playback (in
this case, in Rhythmbox) causes the video player to crash.
I expected the video (with its audio track) to continue playback without
crashing, while Rhythmbox gets mixed in as a second, concurrent audio
sour
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