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Bug#671801: Wacom tablet in Thinkpad X220 Tablet not working with linux-image-3.2.0-2-amd64_3.2.18-1_amd64



Hello,
the wacom tablet in my Thinkpad x220t stopped working after the update
to linux-image-3.2.0-2-amd64_3.2.18-1_amd64. (The same also occurs with
the 3.4 kernel in sid.)

I am posting this as a comment to this bug because the changelog
indicates that this was the only wacom-related change from version 17 to
18.

lsusb knowns my tablet as
Bus 002 Device 004: ID 056a:00e6 Wacom Co., Ltd

With version 18 and above lsusb -t gives
Port 5: Dev 4, If 0, Class=HID, Driver=, 12M
instead of the expected
Port 5: Dev 4, If 0, Class=HID, Driver=wacom, 12M
and consequently the device does not work.

During booting I see the following in /dev/log/syslog:
input: Wacom ISDv4 E6 Pen
as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0/input/input7
However, afterwords the corresponding input directory and especially the
file input/input7 is not there.

Reloading the wacom module does not change the situation and only
produces the following in /dev/log/syslog:
usbcore: deregistering interface driver wacom
usbcore: registered new interface driver wacom
wacom: v1.53:USB Wacom tablet driver

After going back to version 17 of linux-image everything works again.

Best regards
Nils

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