I have the same problem with my Intel audio device. As a workaround, I changed the Sound Preferences and Volume Applet settings to make my media keys and the volume applet both control PCM instead of Master Volume.
$ lspci -n | grep `lspci | grep -i audio| awk '{print $1}'` 00:1b.0 0403: 8086:27d8 (rev 01)
$ sudo lspci -vv -s 00:1b 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01) Subsystem: Hewlett-Packard Company Unknown device 30a5 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 21 Region 0: Memory at d0340000 (64-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable- Address: 0000000000000000 Data: 0000 Capabilities: [70] Express Unknown type IRQ 0 Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag- Device: Latency L0s <64ns, L1 <1us Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported- Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+ Device: MaxPayload 128 bytes, MaxReadReq 128 bytes Link: Supported Speed unknown, Width x0, ASPM unknown, Port 0 Link: Latency L0s <64ns, L1 <1us Link: ASPM Disabled CommClk- ExtSynch- Link: Speed unknown, Width x0
$ lsmod | grep snd snd_hda_intel 263712 4 snd_pcm_oss 44672 0 snd_mixer_oss 17664 1 snd_pcm_oss snd_pcm 80388 3 snd_hda_intel,snd_pcm_oss snd_seq_dummy 4740 0 snd_seq_oss 33152 0 snd_seq_midi 9600 0 snd_rawmidi 25728 1 snd_seq_midi snd_seq_midi_event 8448 2 snd_seq_oss,snd_seq_midi snd_seq 53232 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event snd_timer 24324 3 snd_pcm,snd_seq snd_seq_device 9228 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq snd 54660 15 snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device soundcore 8800 1 snd snd_page_alloc 11400 2 snd_hda_intel,snd_pcm
I have the same problem with my Intel audio device. As a workaround, I changed the Sound Preferences and Volume Applet settings to make my media keys and the volume applet both control PCM instead of Master Volume.
$ lspci -n | grep `lspci | grep -i audio| awk '{print $1}'`
00:1b.0 0403: 8086:27d8 (rev 01)
$ sudo lspci -vv -s 00:1b
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+ ,D1-,D2- ,D3hot+ ,D3cold+ )
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [70] Express Unknown type IRQ 0
Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag-
Device: Latency L0s <64ns, L1 <1us
Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
Device: MaxPayload 128 bytes, MaxReadReq 128 bytes
Link: Supported Speed unknown, Width x0, ASPM unknown, Port 0
Link: Latency L0s <64ns, L1 <1us
Link: ASPM Disabled CommClk- ExtSynch-
Link: Speed unknown, Width x0
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
Subsystem: Hewlett-Packard Company Unknown device 30a5
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 21
Region 0: Memory at d0340000 (64-bit, non-prefetchable) [size=16K]
$ lsmod | grep snd intel,snd_ pcm_oss oss,snd_ seq_midi dummy,snd_ seq_oss, snd_seq_ midi,snd_ seq_midi_ event dummy,snd_ seq_oss, snd_seq_ midi,snd_ rawmidi, snd_seq intel,snd_ pcm_oss, snd_mixer_ oss,snd_ pcm,snd_ seq_oss, snd_rawmidi, snd_seq, snd_timer, snd_seq_ device intel,snd_ pcm
snd_hda_intel 263712 4
snd_pcm_oss 44672 0
snd_mixer_oss 17664 1 snd_pcm_oss
snd_pcm 80388 3 snd_hda_
snd_seq_dummy 4740 0
snd_seq_oss 33152 0
snd_seq_midi 9600 0
snd_rawmidi 25728 1 snd_seq_midi
snd_seq_midi_event 8448 2 snd_seq_
snd_seq 53232 6 snd_seq_
snd_timer 24324 3 snd_pcm,snd_seq
snd_seq_device 9228 5 snd_seq_
snd 54660 15 snd_hda_
soundcore 8800 1 snd
snd_page_alloc 11400 2 snd_hda_