I am running Kubuntu 12.04 with the 3.2.0.23 lowlatency kernel. I have installed Kxstudio and am using my XStation 25 rather successfully with jackdbus. I have disabled pulseaudio on kde and am routing everything via jack and using the pulseaudio bridge for applications like skype which seem to need it.
Now I am trying to use a master mixer for jack to control my hardware channels, so as a result settled on Kmix (started as env KMIX_PULSEAUDIO_DISABLE=1 kmix to disable pulse and to show alsa channels).
However I noted that while my onboard sound card showed up, the Xstation didn't. So i did
sudo lsusb -v
Output here:
aplay -L - Output here:
Key thing to note in the output of aplay was:
card 3: XStation [XStation], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0
The Subdevices show 0/1 AFTER I boot into kde (it shows 1/1 immediately on boot prior to logging into kde prior to jackdbus/pulseaudio kicking in...however other cards remain 1/1)
mendred@dantooine:~$ alsamixer -c3
cannot load mixer controls: Invalid argument
So I tweaked around with my /etc/modprobe.d/alsa-base.conf and added ignore_ctl_error=1 to the snd-usb-audio module
options snd-usb-audio index=-2 ignore_ctl_error=1 nrpacks=1
and then after restarting (Strangely sudo alsa force-reload didnt get it to work, i needed to restart the comp)
alsamixer -c3
brought up the XStation mixer and it was visible on kmix as well
However, the volumes could either be set at 0 or at 100 and nothing in between and it didnt seem that the XStation responded to the software mixer (e.g. muting it didnt mute anything for e.g.). Also the system became unstable and froze repeatedly, so I have turned back ignore_ctl_error=0
The wierd thing is that XStation works fine under both pulseaudio using pavu control and jack.
I am assuming that this is some issue with the driver that deals with the mixer part? Any help on working around this to get a working alsa mixer would be appreciated!
Thanks!
Bharat
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