Agreed. I have no idea how the fix for the 9i speakers was engineered.
It is in the form of a bunch of modifications to the 0x20 widget of the
card using hda-verb.
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The problem is that the BIOS doesn't activate the amplifiers on the
bottom of the body. Someone sent in an unofficial BIOS for the C940
that fixes the problem for the C940 only. See
https://bugzilla.kernel.org/show_bug.cgi?id=205755
There is a related problem with the 9i that has a proposed fix
The mic problem should be addressed by upgrades to the sof drivers. You
may have to get some sort of quirk added for the C930.
The speaker problem is very likely an amp that is not turned on. See
https://bugzilla.kernel.org/show_bug.cgi?id=205755 for more information
and a partial fix for 14" C9
I have the same problem.
If someone tells me how to elicit the correct settings under Windows I can get
them and try them out in Linux.
If someone tells me what possible settings might work under Linux (or tells me
how to figure out what settings might work) I can try to find the right
settings.
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