Comment 438 for bug 85488

Slightly off-topic, but maybe worth mentioning:

I've noticed that if you've got a Feisty kernel (2.6.20-16-generic) and you add the line

options usbcore autosuspend=0

to /etc/modprobe.d/usb-core-options, as was suggested on comment #318 (https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/85488/comments/318) not only will it have no effect -as the autosuspend option was only added in later kernel versions-, but also will stop your USB sticks from mounting.

So, if you are experiencing this side effect on Feisty, simply remove the above mentioned line from /etc/modprobe.d/usb-core-options, then run 'sudo update-initramfs -u' and reboot.

The effect of having that option enabled on my Feisty system was, as mentioned, that my USB stick would not automount (or be recognised at all), and the output of 'dmesg | grep usb' showing the following:

Sep 7 15:48:20 microstar kernel: [ 45.077629] usbcore: Unknown parameter `autosuspend'
Sep 7 15:48:20 microstar kernel: [ 45.079045] uhci_hcd: Unknown symbol usb_hcd_pci_suspend
Sep 7 15:48:20 microstar kernel: [ 45.079180] uhci_hcd: Unknown symbol usb_hcd_resume_root_hub
Sep 7 15:48:20 microstar kernel: [ 45.079262] uhci_hcd: Unknown symbol usb_hcd_pci_probe
Sep 7 15:48:20 microstar kernel: [ 45.079426] uhci_hcd: Unknown symbol usb_check_bandwidth
Sep 7 15:48:20 microstar kernel: [ 45.079574] uhci_hcd: Unknown symbol usb_disabled
Sep 7 15:48:20 microstar kernel: [ 45.079661] uhci_hcd: Unknown symbol usb_release_bandwidth
Sep 7 15:48:20 microstar kernel: [ 45.079980] uhci_hcd: Unknown symbol usb_claim_bandwidth
Sep 7 15:48:20 microstar kernel: [ 45.080183] uhci_hcd: Unknown symbol usb_hcd_pci_resume
Sep 7 15:48:20 microstar kernel: [ 45.080372] uhci_hcd: Unknown symbol usb_hcd_giveback_urb
Sep 7 15:48:20 microstar kernel: [ 45.080464] uhci_hcd: Unknown symbol usb_hcd_poll_rh_status
Sep 7 15:48:20 microstar kernel: [ 45.080628] uhci_hcd: Unknown symbol usb_hcd_pci_remove
Sep 7 15:48:20 microstar kernel: [ 45.080723] uhci_hcd: Unknown symbol usb_root_hub_lost_power