Comment 7 for bug 237357

For me, not working yet.

$ uname -r
2.6.31-2-generic

Dmesg:
[ 3240.508063] usb 4-1: new full speed USB device using uhci_hcd and address 2
[ 3240.671183] usb 4-1: configuration #1 chosen from 1 choice
[ 3240.775235] USB Serial support registered for pl2303
[ 3240.775263] pl2303 4-1:1.0: pl2303 converter detected
[ 3240.787172] usb 4-1: pl2303 converter now attached to ttyUSB0
[ 3240.787196] usbcore: registered new interface driver pl2303
[ 3240.787198] pl2303: Prolific PL2303 USB to serial adaptor driver

$ pcsc_scan
PC/SC device scanner
V 1.4.15 (c) 2001-2009, Ludovic Rousseau <email address hidden>
Compiled with PC/SC lite version: 1.4.102
SCardEstablishContext: Service not available.

The result is worse now. Now it doesn't display any messages with pcsc_scan and the green led only shine when disconnect.