At Sat, 16 May 2015 08:25:57 -0700, Greg KH wrote:

On Sat, May 16, 2015 at 04:25:23PM +0200, Heinz Diehl wrote:

...

Hi,

this is the Jabra Evolve 40 MS headset: Bus 001 Device 008: ID 0b0e:0305 GN Netcom

When plugged in, dmesg says:

[ 247.215998] usb 1-5: new full-speed USB device number 8 using xhci_hcd [ 247.384000] usb 1-5: New USB device found, idVendor=0b0e, idProduct=0305 [ 247.384008] usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 247.384012] usb 1-5: Product: Jabra EVOLVE LINK MS [ 247.384016] usb 1-5: Manufacturer: GN Netcom A/S [ 247.384019] usb 1-5: SerialNumber: 0001A3E08CFC09 [ 247.386542] usb 1-5: 1:1: cannot get freq at ep 0x83 [ 247.388490] usb 1-5: 2:1: cannot get freq at ep 0x4 [ 247.406532] input: GN Netcom A/S Jabra EVOLVE LINK MS as /devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.3/0003:0B0E:0305.0009/input/input12 [ 247.457203] hid-generic 0003:0B0E:0305.0009: input,hiddev0,hidraw1: USB HID v1.00 Device [GN Netcom A/S Jabra EVOLVE LINK MS] on usb-0000:00:14.0-5/input3 [ 247.467683] usb 1-5: 1:1: cannot get freq at ep 0x83 [ 247.467912] usb 1-5: 1:1: cannot get freq at ep 0x83 [ 247.473505] usb 1-5: 2:1: cannot get freq at ep 0x4 [ 247.473718] usb 1-5: 2:1: cannot get freq at ep 0x4 [ 247.475488] usb 1-5: 1:1: cannot get freq at ep 0x83 [ 247.475721] usb 1-5: 1:1: cannot get freq at ep 0x83 [ 247.481899] usb 1-5: 2:1: cannot get freq at ep 0x4 [ 247.482097] usb 1-5: 2:1: cannot get freq at ep 0x4 [ 247.483351] usb 1-5: 1:1: cannot get freq at ep 0x83 [ 247.483566] usb 1-5: 1:1: cannot get freq at ep 0x83 [ 247.487396] usb 1-5: 2:1: cannot get freq at ep 0x4 [ 247.487586] usb 1-5: 2:1: cannot get freq at ep 0x4 [ 247.494730] usb 1-5: 1:1: cannot get freq at ep 0x83 [ 247.495018] usb 1-5: 1:1: cannot get freq at ep 0x83

The micro/playback devices show up, but there's no sound and the mic is also dead.

I've spent the last two days reading on the net, tried a lot of different options, but whithout any success. In a lot of similar bug reports, people point out that this is a bug in the Linux kernel USB subsystem..

What can I do to debug this further, in order to get a working headset?

The sound developers should be able to help you (added to the cc:)

Try to add the USB ID of your device to snd_usb_get_sample_rate_quirk() in sound/usb/quirks.c. This should suppress the sample rate inquiries.

Takashi