[Bugme-new] [Bug 41342] New: Audio gain is massively higher in kernel 3.1

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=41342

           Summary: Audio gain is massively higher in kernel 3.1
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.0-rc2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Sound(ALSA)
        AssignedTo: perex at perex.cz
        ReportedBy: rockorequin at hotmail.com
        Regression: Yes


The audio volume is much, much louder in 3.1-rc2 and -rc1 compared to kernel
3.0 and earlier for my card:

00:1b.0 Audio device: Intel Corporation 6 Series Chipset Family High Definition
Audio Controller (rev 05)
    Subsystem: Dell Device 050e
    Flags: bus master, fast devsel, latency 0, IRQ 53
    Memory at f1c00000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: snd_hda_intel
    Kernel modules: snd-hda-intel


Sound blasts out deafeningly unless I use alsamixer to adjust Master to zero
(alsamixer says this is -64dB) and PCM to near to zero (eg a value like 27, ie
-29dB).

Note that with kernel 3.0, adjusting PCM in alsamixer does not affect the sound
gain, but in 3.1 it (luckily!) does. It's quite difficult to adjust the sound
to a non-painful level using gnome-volume control because the gain is biased so
high.

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