Ubuntu
linux package

  1. Bug #889953
  2. Comment #12

Comment 12 for bug 889953

Revision history for this message
In , John (john-redhat-bugs) wrote :

Created attachment 364024
/proc/bus/usb/devices

Description of problem: ALSA complains in /var/log/messages when I plug in a USB2.0 hub that has an internal audio device.

Version-Release number of selected component (if applicable):
kernel-2.6.31.1-56.fc12.x86_64

How reproducible:

Steps to Reproduce:
1. hotplug USB2.0 hub with internal audio device
2.
3.

Actual results:
kernel: ALSA sound/usb/usbaudio.c:882: cannot submit datapipe for urb 0, error -28: not enough bandwidth

Expected results: no complaints

Additional info: the hub is "Bus=01 Lev=02" in the attached output from /proc/bus/usb/devices. Notice that the hub itself (and the internally connected video and ethernet devices, as well as the four empty ports on the hub) is high speed (480Mb/s) while the audio device is only full speed (12Mb/s).