*** This bug is a duplicate of bug 500069 *** https://bugs.launchpad.net/bugs/500069
I don't think it is a duplicated one with bug #500069. >From the log, some failure happened during writing sector to usb HDD. and >caused " flush" task hang, then lowered speed, but seems no such kind of errors in bug #500069. In fact, long ago, there were a patch[1](just a quirk) to make the device[152d:2329] work well, so it is a regression? Considered it is easily reproduced for you, could you provide some usbmon data to help fix the problem? About how to trace usbmon, see Documentation/usb/usbmon.txt. [1] commit 3030ca4cf4abbdd2dd850a14d20e9fca5937ffb5 Author: Phil Dibowitz <p...@ipom.com> Date: Sun Oct 19 08:17:54 2008 +0200 USB: storage: Avoid I/O errors when issuing SCSI ioctls to JMicron USB/ATA bridge Here's the patch that implements the fix you suggested to avoid the I/O errors that I was running into with my new USB enclosure with a JMicron USB/ATA bridge, while issuing scsi-io USN or other such queries used by Fedora's mkinitrd. http://bugzilla.kernel.org/show_bug.cgi?id=9638#c85 ** Bug watch added: Linux Kernel Bug Tracker #9638 http://bugzilla.kernel.org/show_bug.cgi?id=9638 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/758430 Title: USB storage device slow with reset and I/O error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/758430/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs