I have tried to install the drivers in various ways: first by hand as one used to (get the firmware packages, make install, use fxload and usx2yloader to activate the device). Then I realised that the interface now works plug and play - it gets activated if I just plug it in on a fresh install of kxStudio and becomes visible in Jack. I have also tried both the alsa-firmware packages that come with the release and the latest packages from the alsa project. All these different approaches lead to the same errors.
Even on a fresh install, plugging the device and then going to System-Settings->Multimedia->Audio-and-Video-Setup instantly causes a kernel panic (with the us2xy drivers being mentioned in the error messages). Also I cannot start Jack as soon as I choose the device in Jack.
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20:50:50.604 D-BUS: JACK server could not be started. Sorry
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock
Sun Oct 11 20:50:50 2015: Starting jack server...
Sun Oct 11 20:50:50 2015: JACK server starting in realtime mode with priority 10
Sun Oct 11 20:50:50 2015: self-connect-mode is "Don't restrict self connect requests"
Sun Oct 11 20:50:50 2015: ERROR: cannot register object path "/org/freedesktop/ReserveDevice1/Audio2": A handler is already registered for /org/freedesktop/ReserveDevice1/Audio2
Sun Oct 11 20:50:50 2015: ERROR: Failed to acquire device name : Audio2 error : A handler is already registered for /org/freedesktop/ReserveDevice1/Audio2
Sun Oct 11 20:50:50 2015: ERROR: Audio device hw:USX2Y cannot be acquired...
Sun Oct 11 20:50:50 2015: ERROR: Cannot initialize driver
Sun Oct 11 20:50:50 2015: ERROR: JackServer::Open failed with -1
Sun Oct 11 20:50:50 2015: ERROR: Failed to open server
Sun Oct 11 20:50:52 2015: Saving settings to "/home/myx/.config/jack/conf.xml" ...
20:50:52.686 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock
I'd be grateful for any help - let me know what data I should post.
L