Hi, I recently got a Plantronics .audio 910 USB headset. It is correctly detected by snd-usb-audio and works, but I cannot change the volume of the PCM output or the MIC input. When executing alsamixer -c 1, the volumes seem to be locked and cannot be changed as usual. Unfortunately the microphone volume is at 0, leading to very poor quality of the recorded voice (especially in Skype, which seems to try to compensate the low volume and fails miserably). I tried the headset with three different PCs, all with the same result. A desktop at work running Fedora 7, a Thinkpad R50p running debian/testing and the 2.6.22 kernel provided in debian/testing. The third one is a Dell precision M65 with debian/unstable and a vanilla 2.6.24.2 kernel and latest alsa drivers from the mercurial repository. When loading the snd-usb-audio module, dmesg shows the following kernel output (on the M65): usb 2-2: new full speed USB device using uhci_hcd and address 5 usb 2-2: configuration #1 chosen from 1 choice input: Plantronics Plantronics BT Adapter as /devices/pci0000:00/0000:00:1d.1/usb2/2-2/2-2:1.3/input/input10 input: USB HID v1.11 Device [Plantronics Plantronics BT Adapter] on usb-0000:00:1d.1-2 usbcore: registered new interface driver usbhid drivers/hid/usbhid/hid-core.c: v2.6:USB HID core driver ALSA /usr/src/alsa-driver-d20080221_0154-k20080223_0534/usb/usbaudio.c:2746: 5:1:1 : no or invalid class specific endpoint descriptor ALSA /usr/src/alsa-driver-d20080221_0154-k20080223_0534/usb/usbaudio.c:2746: 5:2:1 : no or invalid class specific endpoint descriptor usbcore: registered new interface driver snd-usb-audio I posted the output of alsa-info.sh and lsusb -v on pastebin (both taken on the M65). alsa-info.sh: http://pastebin.ca/915715 lsusb -v: http://pastebin.ca/915723 -- CU, Christian Klein http://www.garfield.com/comics/comics_archives_strip.html?2005-ga050927 Homepage: http://www.mpi-sb.mpg.de/~cklein
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