Hello!
I am having a strange problem with Emagic EMI 6|2 USB sound card and ALSA
1.0.11. The setup I am running is a Fedora Core 5 with kernel, alsa and jack
from Planet CCRMA. The strange thing is that the very same hardware has been
working perfectly earlier with FC3 (do not remember exact ALSA revision) and
even on Red Hat 9 on a 2.4 series kernel! The kernel I am running is a 2.6.16-1
with realtime pre-empt enabled.
This is what happens:
I start Jack forcing it to use 16-bit samples -everything is fine.
I start Jack with playback only with 24-bit samples -everything is fine again.
I try to start Jack in Duplex mode with 24-bit samples and I get this output
from jack:
....
When this happens this pops into the system log in /var/log/messages:
Nov 2 21:13:48 Computer kernel: ALSA
/usr/src/rpm/BUILD/alsa-driver-1.0.11/usb/usbaudio.c:864: cannot submit datapipe
for urb 0, error -28: not enough bandwidth
Nov 2 21:13:53 Computer kernel: ohci_hcd 0000:00:03.0: leak ed f59371c0 (#8c)
state 2
This makes me think that something is wrong with ALSA - not jack or the kernel.
Or could this be just a configuration error?
I tried to dig everything I could find on this from ALSA wiki and mailing lists
and tried every trick I found - loading the kernel module with different nrpacks
settings, etc. but with no luck.
Pointers on what to do next would be highly appreaciated!
Thanks,
Jorma
There's a note in the manual: Due to USB bandwith limitations, the A62 can only use 24-bit resolution in one direction at a time - i.e. either for playback or recording.
This is in the Windows section, but USB bandwith is the same for Linux, so I guess the same limitation applies..
Groeten,
Geerten.
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