On 08/06/2014 06:43 PM, Dr Nicholas J Bailey wrote:
On Thursday 26 June 2014 15:51:54 Dr Nicholas J Bailey wrote:
I am having trouble with the US122 in playback and duplex mode. In capture mode, it is working.
This problem occurs on (at least) Linux arial 3.14-1-686-pae #1 SMP Debian 3.14.7-1 (2014-06-16) i686 GNU/Linux
Further information:
Using this kernel:
Linux arial 3.14-2-686-pae #1 SMP Debian 3.14.13-2 (2014-07-24) i686 GNU/Linux
trying to use the US-122 Tascam box results in the following showing up in dmesg. I have unplugged and reconnected the box twice to get the LEDs to light up. This has been the normal behaviour for as long as I can remember. You can only use the Tascam as capture device on this kernel.
Using this kernel:
Linux arial 3.10.11 #1 SMP Wed Oct 2 19:26:59 BST 2013 i686 GNU/Linux
the US-122 works fine for simultaneous capture and playback.
I've looked at the difference in the source code between 3.10 and 4.14 and there is very little in the usb-usx2y alsa module. Is there some midi-related change I should know about?
This driver is unfortunately poorly supported by the community. Very few people have such a device, the driver has ample areas it needs cleanups in, and the original author is unfortunately unresponsive.
The best thing you can do is probably bisect the issue:
https://wiki.ubuntu.com/Kernel/KernelBisection
I understand that the US-122 is a usb-1.1 device and I have the ehci module loaded, but it was there too with the older kernel and that worked fine.
Yes, that shouldn't be an issue. Let us know what the bisection tells you.
Daniel