[Bug 42194] Non-functional Master mixer control on Intel 8x0

[Jan Michael Ibanez]

Public bug reported:

On a Fujitsu Lifebook C-series (using an Intel on-board soundcard), the
master mixer control does nothing, and an additional mixer control
("Headphones") seems to act as the master control. After searching the
Net, it seems that some cards do have a quirk that can be enabled in the
kernel. Setting ac97_quirk=hp_only in an options line in /etc/modprobe.d
/alsa-base fixes things, and now the Master mixer control does act as
the master mixer control-- the keyboard FN keys to adjust the volume now
work because of this (previously, they would touch the non-functional
Master control).

I really don't know if this can be detected, but it should be useful for
anyone doing support to point this out as a possibility. Also, I haven't
encountered any big issues or side effects concerning the quirk, so
enabling it by default might be possible (although I personally wouldn't
suggest it).

(This sounds like bug #35717, but I have my doubts)

** Affects: linux-source-2.6.15 (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

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Non-functional Master mixer control on Intel 8x0
https://launchpad.net/bugs/42194