<p><br>
>>><br>
>>> After Ubuntu 10.04 LTS (Ubuntu 10.10 works, Ubuntu 11.04 doesn't work at<br>
>>> all, Ubuntu 11.10 and newer have the bug), the headset only plays sound<br>
>>> at maximum volume level if the volume is turned down just a little no<br>
>>> sound is being played.<br>
>>><br>
>>> I have filled a Ubuntu bug for 12.04 LTS at:<br>
>>> <a href="https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1200925">https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1200925</a> .<br>
>>> I was advised to contact this mailing list.<br>
>>><br>
>>> AlsaInfo for Ubuntu 12.04 LTS with the bug:<br>
>>> <a href="http://www.alsa-project.org/db/?f=3bde76b15a15f585418a6a4a4703ca67fd4cdf42">http://www.alsa-project.org/db/?f=3bde76b15a15f585418a6a4a4703ca67fd4cdf42</a> .<br>
>>> AlsaInfo for Ubuntu 10.04 LTS without the bug:<br>
>>> <a href="http://www.alsa-project.org/db/?f=5824e55345c3f7128937405254485a489886b9dc">http://www.alsa-project.org/db/?f=5824e55345c3f7128937405254485a489886b9dc</a> <br>
>><br>
>><br>
>><br>
>> It is strange that dB range of your usb audio is 0 to 0.14 (only small gain and no attenuation)<br>
>><br>
>> In 10.04 LTS pulseaudio provide software volume control<br>
>><br>
>><br>
>> ( 1.095| 0.000) I: alsa-sink.c: Driver does not support hardware volume control, falling back to software volume control.<br>
>><br>
>><br>
>> control.6 { <br>
>> comment.access 'read write' <br>
>> comment.type INTEGER <br>
>> comment.count 1 comment.range '0 - 37' <br>
>> comment.dbmin 0 comment.dbmax 14 <br>
>> iface MIXER <br>
>> name 'Speaker Playback Volume' value 30 }<br>
>><br>
>><br>
>> In 12.04 pulseaudio did not provide software volume attenuation and use the speaker playback volume control<br>
><br>
><br>
> So does that mean that the bug is in pulseaudio, or could it be even deeper like in the kernel or something?<br></p>
<p>Are there any significant change in volume when you use "alsamixer -c0" to change speaker playback volume from min 0dB to 0.14dB ? <br></p>
<p>Did pulseaudio provide software attuentation -1.61dB when the range of hardware volume control is only 0.14dB ?<br><br></p>
<p>* index: 0<br>
name: <alsa_output.usb-0d8c_USB_Audio-00-Audio.analog-surround-71><br>
driver: <module-alsa-card.c><br>
flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY<br>
state: SUSPENDED<br>
suspend cause: IDLE <br>
priority: 9049<br>
volume: 0: 94% 1: 94% 2: 94% 3: 94% 4: 94% 5: 94% 6: 94% 7: 94%<br>
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<br>
balance 0,00<br>
base volume: 99%<br>
-0,14 dB<br>
volume steps: 65537<br>
muted: no</p>
<p>It is strange that 5.1 headset only support 8 channels playback</p>