I have a Plantronics Savi 7xx-M headset attached via USB to my computer (HP EliteBook 8560w) running Fedora 17 Linux. I started to get weird lockups of my mouse or constant mouse click actions. Short story buggy driver with Linux kernel 3.4.5-2.fc17.x86_64. I also constantly saw "ALSA sound/usb/clock.c:236 22:2:1: cannot get freq at ep 0x84" in my logs.
- Unplug the headset USB cable
- Edit /etc/modprobe.d/blacklist.conf
- blacklist snd_usb_audio
- modprobe -r snd_usb_audio
- Note that you can no longer use the headset in Linux. You can use it inside a VM though.
Update - 16 Aug 2012
I received the following message from Gerben Meijer (thanks!) with some pointers on some work arounds:
I ran into two issues with it.
One, the mouse/keyboard problem you mentioned. The device presents itself as an usb sound card, a mouse and a keyboard. To make X11 ignore the keyboard and mouse features (which are fine in windows but Xorg does not like it), I added this to xorg.conf:
Option "Ignore" "true"
This will make X11 ignore the mouse and keyboard features and stop weird things from happening.
So then you can use the USB audio card, but I ran into another issue there. On linux, all audio was clipping. Turns out this was a Pulseaudio bug: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/416190
Which was pushed upstream to pulseaudio only yesterday.
So with those things in place it works perfectly fine on Linux; I do recommend configuring it to wideband audio once in Windows. It seems to remember those settings. Haven't found a way to control those from Linux.