Comment 5 for bug 614351

I have similar issue. When I plug in my USB flash it is not detected at all. Restart of udev does nothing, plugging again does nothing. The only thing that helps is to execute 'sudo lsusb'.

$ dmesg | grep -E "udev|usb"

[ 0.389104] usbcore: registered new interface driver usbfs
[ 0.389131] usbcore: registered new interface driver hub
[ 0.389188] usbcore: registered new device driver usb
[ 0.775363] usb usb1: configuration #1 chosen from 1 choice
[ 0.775863] usb usb2: configuration #1 chosen from 1 choice
[ 0.776246] usb usb3: configuration #1 chosen from 1 choice
[ 0.776632] usb usb4: configuration #1 chosen from 1 choice
[ 0.777016] usb usb5: configuration #1 chosen from 1 choice
[ 1.020598] udev: starting version 151
[ 1.288082] usb 4-2: new low speed USB device using uhci_hcd and address 2
[ 1.464643] usb 4-2: configuration #1 chosen from 1 choice
[ 1.482197] usbcore: registered new interface driver hiddev
[ 1.497126] input: Logitech USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:1d.2/usb4/4-2/4-2:1.0/input/input4
[ 1.497668] generic-usb 0003:046D:C050.0001: input,hidraw0: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:1d.2-2/input0
[ 1.497726] usbcore: registered new interface driver usbhid
[ 1.498019] usbhid: v2.6:USB HID core driver
[ 3.421102] udev: starting version 151

# HERE IS THE UDEV RESTART
[419215.019313] udev: starting version 151

# HERE IS THE LSUSB
[419248.176074] usb 1-8: new high speed USB device using ehci_hcd and address 3
[419248.310622] usb 1-8: configuration #1 chosen from 1 choice
[419248.770699] usbcore: registered new interface driver usb-storage
[419248.774423] usb-storage: device found at 3
[419248.774428] usb-storage: waiting for device to settle before scanning
[419253.772308] usb-storage: device scan complete

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I am using Ubuntu 10.04 LTS with kubuntu-desktop installed. Running KDE 4.5.0 (4:4.5.0b-0ubuntu1~lucid1~ppa2). The same issue was visible on Ubuntu 9.10.

$ uname -a
Linux kkapuscik-u 2.6.32-24-generic #39-Ubuntu SMP Wed Jul 28 06:07:29 UTC 2010 i686 GNU/Linux

$ cat /etc/*-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04.1 LTS"

$ dpkg --list | grep udev
ii libudev0 151-12 udev library
ii udev 151-12 rule-based device node and kernel event mana

$ dpkg --list | grep usb
ii libusb-0.1-4 2:0.1.12-14ubuntu0.2 userspace USB programming library
ii libusb-1.0-0 2:1.0.6-1 userspace USB programming library
ii usbutils 0.86-2ubuntu1 Linux USB utilities