On Tue, Mar 18, 2008 at 04:11:17PM +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). > Does anyone know how to fix this? > I found similar reports on the internet for various usb headsets, but no > real fix for the situation. > I already asked on alsa-users some weeks ago, but did not get any response. > > I tried the headset on 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. > There, I used a vanilla 2.6.24.2 kernel and latest alsa drivers from the > mercurial repository when I asked on alsa-users, but in the meantime I > upgraded to 2.6.24.3 and hg snapshots from 2008-03-13 06:41 > (alsa-driver) and 2008:03:17 05:23 (alsa-kernel), but still got the same > behaviour. > On all I get some message about "no or invalid class specific endpoint > descriptor" in the kernel log (see below). > 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/kernel-modules/alsa-driver-d20080313_0641-k20080317_0523/usb/usbaudio.c:2787: 5:1:1 : no or invalid class specific endpoint descriptor > ALSA /usr/src/kernel-modules/alsa-driver-d20080313_0641-k20080317_0523/usb/usbaudio.c:2787: 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 Does no one have a clue what could be the cause for this behaviour? If I boot windows, the headset works flawlessly. Unfortunately I have no clue what could be wrong or where else to find information about this problem. -- CU, Christian Klein http://www.garfield.com/comics/comics_archives_strip.html?2003-ga031023 Homepage: http://www.mpi-sb.mpg.de/~cklein
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