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| author | Hans de Goede <hdegoede@redhat.com> | 2012-05-07 09:24:35 +0200 |
|---|---|---|
| committer | malc <av1474@comtv.ru> | 2012-05-07 16:31:40 +0400 |
| commit | d044be3714db9c3750c430a2bb1be74beee6fd27 (patch) | |
| tree | f401d0f9673f9fa1dce107a7901ece3b478798b5 /hw/acpi.c | |
| parent | a4e652ebc0b2c473f2ded93e8528095da8251c6a (diff) | |
| download | qemu-d044be3714db9c3750c430a2bb1be74beee6fd27.zip qemu-d044be3714db9c3750c430a2bb1be74beee6fd27.tar.gz qemu-d044be3714db9c3750c430a2bb1be74beee6fd27.tar.bz2 | |
hw/ac97: Make a bunch of mixer registers read only
The Linux ac97 driver tries to see if optional things like video input
volume control are available in 2 ways:
1) See if the mute bit is set after reset, if it is no further tests are done
2) If the mute bit is not set it does a write/read test of the mute bit
This patch changes our ac97 to conform to what the Linux driver expects, it
initializes registers for things which we don't emulate to 0 (so the mute bit
is not set) and makes them read only.
This causes Linux to now longer show the following (functionless)
controls in alsamixer:
Master Mono vol + mute
3d Control toggle
PCM out pre / post 3d select
Surround toggle
CD vol + mute
Mic vol + mute
Mic boost toggle
Mic mic1 / mic2 select
Video vol + mute
Phone vol + mute
Beep mono vol + mute
Aux vol + mute
Mono "output mic" / "mix" select
Sigmatel 4 speaker stereo toggle
Sigmatel ADC 6Db att toggle
Sigmatel DAC 6Db att toggle
This patch was also tested with a Windows XP guest and there it also makes
a number of functionless mixer controls go away.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: malc <av1474@comtv.ru>
Diffstat (limited to 'hw/acpi.c')
0 files changed, 0 insertions, 0 deletions