Description of problem:
Using an external USB audio controller, the output is suddenly mute when lowering the volume below 35%. This is disturbing because it's impossible to keep playing music in the background.
Version-Release number of selected component (if applicable):
Everytime. Also, when fixed somehow, the issue reappears after major updates or upgrades (like from F21 to F22).
Steps to Reproduce:
1. Play music file
2. Turn volume up above 35% -> loud music
3. Turn it down below 35% -> no sound anymore
Quiet below 35.
Volume regulation below 35% should work just like above 35%. It seems odd that some piece of software can't handle a volume below 35%.
Some time ago (F21), changing a system config file (not sure what exactly) fixed it - until the upgrade to F22.
This is how the config change fixed the issue:
Look for the [Element PCM] section:
switch = mute
volume = merge
override-map.1 = all
override-map.2 = all-left,all-right
Replace the "volume = merge" line with these two lines:
volume = ignore
volume-limit = 0.01
Details on what value to use (instead of 0.01) are explained on that page.
This should be fixed - it's extremely awkward that there's no sound below 35% volume (by default). If config files have to be changed to "fix" this, then it's not working from a user's perspective. And most users won't (and probably shouldn't) open and edit system config files as root.
Same issue after upgrading to Fedora 23.
However, the config file modification does not seem to fix it anymore.
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A bug report has been proposed in ALSA:
The patch should fix this problem for C-Media devices.