I have a problem with an "E-MU Tracker Pre" USB audio card and Kubuntu. When I start the audio card for the first time since boot everything works fine, but after turning it off and on again, regardless of the delay between restarting it, there's a 90% chance it will fail to boot up. All the lights are lit up and stay like that, which is its loading sequence and should turn off in a second, but they stay frozen like that.
I can see the card in my /dev but if I try to open the sound manager or echo/cat some data directly to the card the window freezes until I turn off the card. There is a chance that the card will be recognized properly if I repeatedly turn it on and off, and it has happened once in a blue moon, but I haven't thoroughly tested it as I do not want to burn it.
Moving the AC to another USB port does not help and I can confirm that the problem did not exist in Ubuntu 11.x/12.x
The problem is gone after reboot for one launch of the AC and then reappears again. As it significantly hurts my creative flow I cannot settle for this as a 'solution'.
Up-to date Kubuntu 13.04