Hi all,
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:
http://pastebin.com/3TCxYz8d
aplay -L - Output here:
http://pastebin.com/afgf9LtR
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)
http://ubuntuforums.org/archive/index.php/t-1126128.html
when i do
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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