Comment 0 for bug 93600

Binary package hint: linux-source-2.6.20

Changing level of Master channel from 0 to ~50 doesn't change volume level. Muting master channel doesn't mute volume. Muting PCM does mute it. Changing level of Master channel above 50 does have an impact on sound level.

$ tail -2 /proc/asound/oss/sndstat
Mixers:
0: Analog Devices AD1981

$ amixer
Simple mixer control 'Master',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 63
  Mono:
  Front Left: Playback 32 [51%] [on]
  Front Right: Playback 32 [51%] [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 22 [71%] [-1.50dB] [on]
  Front Right: Playback 22 [71%] [-1.50dB] [on]
Simple mixer control 'Mic',0
  Capabilities: cswitch cswitch-joined cswitch-exclusive
  Capture exclusive group: 0
  Capture channels: Mono
  Mono: Capture [on]
Simple mixer control 'Mic Boost',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 3
  Front Left: 0 [0%]
  Front Right: 0 [0%]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 15
  Front Left: Capture 0 [0%] [0.00dB] [on]
  Front Right: Capture 0 [0%] [0.00dB] [on]
Simple mixer control 'Mix',0
  Capabilities: cswitch cswitch-joined cswitch-exclusive
  Capture exclusive group: 0
  Capture channels: Mono
  Mono: Capture [off]
Simple mixer control 'Caller ID',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Docking-Station',0
  Capabilities: cswitch cswitch-joined cswitch-exclusive
  Capture exclusive group: 0
  Capture channels: Mono
  Mono: Capture [off]
Simple mixer control 'Internal Mic Boost',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 3
  Front Left: 0 [0%]
  Front Right: 0 [0%]
Simple mixer control 'Off-hook',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]

$ lspci -nv
00:1b.0 0403: 8086:27d8 (rev 02)
        Subsystem: 1179:0001
        Flags: bus master, fast devsel, latency 0, IRQ 23
        Memory at 44080000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>

$ asoundconf list
Names of available sound cards:
Intel

$ cat /proc/interrupts
           CPU0 CPU1
  0: 288394 0 IO-APIC-edge timer
  1: 3042 0 IO-APIC-edge i8042
  8: 23 0 IO-APIC-edge rtc
  9: 135 0 IO-APIC-fasteoi acpi
 12: 107 0 IO-APIC-edge i8042
 14: 43633 3844 IO-APIC-edge libata
 15: 12315 0 IO-APIC-edge libata
 17: 36550 0 IO-APIC-fasteoi uhci_hcd:usb3, ipw3945
 18: 1 0 IO-APIC-fasteoi yenta
 19: 3 0 IO-APIC-fasteoi uhci_hcd:usb1, ehci_hcd:usb5, sdhci:slot0, tifm_7xx1
 20: 419 0 IO-APIC-fasteoi uhci_hcd:usb2
 21: 81356 0 IO-APIC-fasteoi uhci_hcd:usb4, i915@pci:0000:00:02.0
 22: 574 0 IO-APIC-fasteoi ohci1394, eth0
 23: 19197 0 IO-APIC-fasteoi HDA Intel
NMI: 0 0
LOC: 288144 288143
ERR: 0
MIS: 0

In -10 at least muting Master channel would mute sound. Now I can't do even that :)