I am having a similar problem on Hardy beta. The master volume seems
mapped to the headphone output. The headphone output appears to be
bass/treble or perhaps one of the 3D controls, it's hard to tell.
00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER (ICH5/ICH5R)
AC'97 Audio Controller (rev 02)
Subsystem: Dell Unknown device 017c
Flags: bus master, medium devsel, latency 0, IRQ 17
I/O ports at d800 [size=256]
I/O ports at dc40 [size=64]
Memory at f8fff800 (32-bit, non-prefetchable) [size=512]
Memory at f8fff400 (32-bit, non-prefetchable) [size=256]
Capabilities: <access denied>
00:1f.6 Modem: Intel Corporation 82801EB/ER (ICH5/ICH5R) AC'97 Modem Controller
(rev 02) (prog-if 00 [Generic])
Subsystem: Conexant Unknown device 5422
Flags: bus master, medium devsel, latency 0, IRQ 17
I/O ports at d400 [size=256]
I/O ports at d080 [size=128]
Capabilities: <access denied>
**** List of PLAYBACK Hardware Devices ****
card 0: ICH5 [Intel ICH5], device 0: Intel ICH [Intel ICH5]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: ICH5 [Intel ICH5], device 4: Intel ICH - IEC958 [Intel ICH5 - IEC958]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Modem [Intel ICH5 Modem], device 0: Intel ICH - Modem [Intel ICH5 Modem
- Modem]
Subdevices: 0/1
Subdevice #0: subdevice #0
--
faulty channel mappings on Intel ICH6
https://bugs.launchpad.net/bugs/77427
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