Hi all, Ubuntu Xenial 16.04 LTS, kernel 4.4.0, kxstudio. I have a problem with my Lexicon Lambda soundcard (new to me, purchased second-hand).

Every now and then, it seems to lock up when I have Jack and Ardour running. syslog contains many lines like:

15 Apr 10 10:35:01 cubase kernel: [ 1072.193677] usb 3-3: 1:2: cannot get freq at ep 0x1

16 Apr 10 10:35:01 cubase kernel: [ 1072.195991] usb 3-3: 2:2: cannot get freq at ep 0x82

I found a post https://www.spinics.net/linux/fedora/alsa-user/msg01899.html suggesting that this device flouts the USB spec, and sure enough:

antony@cubase:~$ lsusb -s3:8 -v |grep -E "(bNumInterfaces|bInterfaceNumber)" |sort|uniq Couldn't open device, some information will be missing

bInterfaceNumber 0

bInterfaceNumber 1

bInterfaceNumber 2

bInterfaceNumber 4

bInterfaceNumber 6

bInterfaceNumber 7

bNumInterfaces 6

I seem to have to hard-reset the card, kill and restart pulseaudio (8.0) and jackd (1.9.11). My concrete questions are:

Am I wasting my time with this card?

Are the errors purely cosmetic (and something in software is locking up?)

Antony