I didn't see the last few comments until today, because I wasn't subscribed to this bug report. Now I am.
The two usbmon traces don't seem to have any significant differences. The problem must lie at a lower level, probably something in the hardware. Is there any way you can try testing the device with a different type of computer? In answer to the questions above: 1) USB 1.1 devices can be either full speed or low speed. This device is full speed. (Low-speed USB does not have enough bandwidth for high- quality audio and does not support isochronous transfers.) 2) The two modes do have different bandwidth requirements; both are well below the limits of full-speed USB. For example, the usbmon traces showed that the device was using no more than 273 bytes of data every millisecond, whereas full-speed USB can transfer over 1000 bytes of isochronous data per millisecond. 3) The buffer size is the same in the working and non-working cases, as far as I can tell. The easiest way for me to work on this may be to buy one of these devices for testing here. Do you know if any of them are available from Amazon? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1136110 Title: USB Audio Codec choppy playback To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1136110/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
