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After Ubuntu 10.04 LTS (Ubuntu 10.10 works, Ubuntu 11.04 doesn't work at all, Ubuntu 11.10 and newer have the bug), the headset only plays sound at maximum volume level if the volume is turned down just a little no sound is being played.

I have filled a Ubuntu bug for 12.04 LTS at: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1200925 . I was advised to contact this mailing list.

AlsaInfo for Ubuntu 12.04 LTS with the bug:

http://www.alsa-project.org/db/?f=3bde76b15a15f585418a6a4a4703ca67fd4cdf42 .

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AlsaInfo for Ubuntu 10.04 LTS without the bug:

http://www.alsa-project.org/db/?f=5824e55345c3f7128937405254485a489886b9dc

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It is strange that dB range of your usb audio is 0 to 0.14 (only small

gain and no attenuation)

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In 10.04 LTS pulseaudio provide software volume control

( 1.095| 0.000) I: alsa-sink.c: Driver does not support hardware volume

control, falling back to software volume control.

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control.6 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 37' comment.dbmin 0 comment.dbmax 14 iface MIXER name 'Speaker Playback Volume' value 30 }

In 12.04 pulseaudio did not provide software volume attenuation and use

the speaker playback volume control

So does that mean that the bug is in pulseaudio, or could it be even

deeper like in the kernel or something?

Are there any significant change in volume when you use "alsamixer -c0" to change speaker playback volume from min 0dB to 0.14dB ?

Did pulseaudio provide software attuentation -1.61dB when the range of hardware volume control is only 0.14dB ?

* index: 0 name: <alsa_output.usb-0d8c_USB_Audio-00-Audio.analog-surround-71> driver: <module-alsa-card.c> flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY state: SUSPENDED suspend cause: IDLE priority: 9049 volume: 0: 94% 1: 94% 2: 94% 3: 94% 4: 94% 5: 94% 6: 94% 7: 94% 0: -1,61 dB 1: -1,61 dB 2: -1,61 dB 3: -1,61 dB 4: -1,61 dB 5: -1,61 dB 6: -1,61 dB 7: -1,61 dB balance 0,00 base volume: 99% -0,14 dB volume steps: 65537 muted: no

It is strange that 5.1 headset only support 8 channels playback