Public bug reported:
I have tested the alsamixer with 2 different 8ch usb sound cards (UAC2
compatible) and the assignment of the volume controls to the respective
channel is partly wrong on both cards. The volume control for rear
changes the volume of the center and subwoofer/LFE and the volume
control for "Center" and "Woofer" changes the volume of the rear
speakers.
According to the usb audio class 2 specification, chapter "4.1 Audio Channel
Cluster Descriptor", the volume controls index must be (for a 8ch sound card):
1 = FL
2 = FR
3 = C
4 = LFE
5 = RL
6 = RR
7 = SL
8 = SR
The current implementation as following assignment:
1 = FL
2 = FR
3 = RL
4 = RR
5 = C
6 = LFE
7 = SL
8 = SR
Unfortunately, I can not judge whether this is a problem in the program
or driver (audio usb).
If you have any questions, feel free to contact me.
** Affects: alsa-utils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1961998
Title:
alsamixer: volume controls are assigned to wrong channels
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