On Thu, 27 Sep 2012, Lassi Väätämöinen wrote: > If it is of any use, I have had similar kind of issue with M-Audio MobilePre > (Mk II) USB audio interface. First the sound gets very noticeable static > noise and soon after the playback just stops. After unplugging the device it > does not get removed fmro the device list, and sometimes the whole USB > subsystem seems to crash (keyboard gets stuck, un-/replugging will not help > etc.) > > The problem has persisted at least since kernel version 3.2 (Ubuntu 11.10), > but for certain it worked on Ubuntu 11.04 (2.6-series kernel). Not sure > about 3.0 kernels. I also have the same issue on openSUSE 12.2, kernel > 3.4.6. > > I have captured an usbmon log on Linux Mint 13 (Ubuntu 12.04-based), and it > is available here: > https://bugs.launchpad.net/ubuntustudio/+bug/1035602 > > Please let me know if this is of any use, and what kind of further > information I can provide The usbmon trace does not show any errors at all. The file doesn't contain any occurrences of "-22", for instance. To be most helpful, you should provide both a dmesg log and a usbmon trace taken at the same time, from a kernel with CONFIG_USB_DEBUG enabled. First unplug all the USB devices, then do "dmesg -c >/dev/null", then plug in all the USB devices, then start the usbmon trace, then run the test. After the failure occurs, collect the trace and the entire dmesg output and post them. Also, it would be good if you could test with the most recent 3.6-rc kernel. The distribution you use doesn't really matter, only the kernel version. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
