On Sun, Feb 24, 2008 at 03:50:49AM +0100, cklein@xxxxxxxxxxxxx wrote: > 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 I tried the newest alsa-driver from the mercurial repository today, but it still does not work. Does anybody know why alsamixer -c 1 cannot change the volume for the headset? With the mic volume locked at 0, the headset is basically useless :( -- CU, Christian Klein http://www.garfield.com/comics/comics_archives_strip.html?2005-ga050515 Homepage: http://www.mpi-sb.mpg.de/~cklein
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