Debian on a ThinkPad X220 tablet
Last modified: Tue Jul 19, 2011 03:52PM
With a 3.0.0-rc7 linux kernel and a fresh from git xf86-input-wacom, most of the hardware is well supported
and does not warrant special instruction.
*: not functional with the debian installer kernel
**: Wacom X in debian/unstable does not support touch
|Wired Ethernet||Intel 82579LM||OK * (driver: e1000e)|
|Wireless Ethernet||Intel Advanced-N 6205||OK (driver: iwlagn|
|GPUIntegrated Intel Sandybridge||OK|
|Screen||LG LP125WH2-SLB1 1366x768 277mm x 156mm IPS||OK|
|Audio||Intel 6 Series/C200 HDA||OK|
|Digitizer||056a:00e6 Wacom (USB)||OK * **|
|Card Reader||Ricoh Co Ltd Device e823||untested|
|Finger Print Reader||147e:2016 Upek||OK|
|HD active protection system||Not yet supported|
I grabbed a current unstable netboot installer. The e1000e in the 2.6.32 kernel included with the installer did not recognize my nic.
The wireless drivers were also unusable. My solution was simply to replace the kernel with one that I built (see below for a usable configuration).
With all the necessary drivers compiled in, instead of compiled as modules, there is no need to rebuild the initrd, simply swap the kernel.
Aside from that, installation was uneventful.
Low battery notification: I'm not sure if the events aren't being sent, or are just being ignored
Single finger swipe power on and login
Widi (not that I've tried)
Access to the accelerometer (hdaps)
Configuration for linux kernel 3.0.0-rc7 thinkpad_x220t_3.0.0-rc7.config.
The current version of xserver-xorg-input-wacom (0.10.10) works perfectly with the pen/eraser but not touch. Grab
a newer version or just clone the git repository (see the instructions at http://sourceforge.net/apps/mediawiki/linuxwacom/index.php?title=Xf86-input-wacom. To prepare for the install run:
sudo apt-get build-dep xserver-xorg-input-wacom
sudo apt-get install libxinerama-dev
Finger Print Reader
Install fprint-demo and libpam-fprint.
If you are not prompted to select pam modules and the finger print reader is not polled for login, run (you should see a debconf dialog):
sudo dpkg-reconfigure libpam-fprint
If you are using a gui login such as gdm or xdm, that should be sufficient to enable keyboard free login.
If not, you can add a custom login script to inittab:
13:23:once:/sbin/getty -n -l /usr/local/sbin/login_default.sh 38400 tty13
Where the content of that script is just:
Fprint seems to leave the reader in full power scan mode. So I don't recommend leaving it on indefinitely (hence the "once" in the inittab).
Windows seems poll the device to reuse the power on finger scan (if you turn on the machine with a swipe). That feature is not supported and I don't
know if anyone is working on it.
Both power buttons do work, however they don't respond instantly. It seems one must press them for about 1 second to emit the acpi events. 5 seconds invokes a hard shutdown.
The binary hinge switch works out of the box. Out of laziness I translate the acpi events to key events (the driver emits switch events through the "ThinkPad Extra Buttons" device) with acpi_fakekey. With that, I can use the normal hotkey map to invoke my rotation script.
A more analog orientation sensor can be enabled in windows. The idea is to track gravitational "down" as the tablet is moved around. The events from this sensor seem to be
coming in through one of the mouse input devices. It will take a bit more fiddling to get a meaningful interpretation.