On Tue, May 7, 2013 at 8:01 PM, chris <1159...@bugs.launchpad.net> wrote: > Hello Ming Lei.. Your request attached. > > ** Attachment added: "dmesg.log" > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1159358/+attachment/3668736/+files/dmesg.log
See below trace, it is the application of 'usb' which releases the usblp kernel driver. I don't find 'usb' in current precise release, and looks it doesn't belong to udev too, so is it your test code? or could you find the package the 'usb' is included with below command? dpkg -S usb [ 220.673914] usblp 2-2:1.1: disconnect by usbfs [ 220.673922] Pid: 2388, comm: usb Tainted: G I 3.2.0-41-generic #65 [ 220.673926] Call Trace: [ 220.673937] [<c13e5d41>] usbdev_do_ioctl+0x1271/0x12b0 [ 220.673945] [<c13e5d80>] ? usbdev_do_ioctl+0x12b0/0x12b0 [ 220.673950] [<c13e5d8d>] usbdev_ioctl+0xd/0x10 [ 220.673957] [<c113f901>] do_vfs_ioctl+0x81/0x570 [ 220.673963] [<c10fa727>] ? kzfree+0x27/0x30 [ 220.673969] [<c1149249>] ? vfsmount_lock_local_unlock+0x19/0x20 [ 220.673976] [<c114a7aa>] ? mntput_no_expire+0x2a/0xd0 [ 220.673981] [<c114a868>] ? mntput+0x18/0x30 [ 220.673986] [<c1130f0c>] ? fput+0x16c/0x1d0 [ 220.673991] [<c112d2d4>] ? filp_close+0x54/0x80 [ 220.673997] [<c113fe58>] sys_ioctl+0x68/0x80 [ 220.674003] [<c1569b84>] syscall_call+0x7/0xb [ 220.674009] [<c1570000>] ? kprobe_dispatcher+0x100/0x210 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1159358 Title: USB Printer & HDD external can't wake up after a moment of time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1159358/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs