This was provided by mardhi on the Bodhi forum and has been successfully tested on an Asus T101MT and an Itronix GoBook 250 with GUNZE touch panel.
1. Open a terminal, type the following text and press Enter.
sudo apt-get install xinput-calibrator
…and enter your password if prompted. The calibration program is then downloaded and installed.
2. Type the following text in the terminal and press Enter.
The calibration program then opens and fills the screen.
3. As the red crosses appear in each corner of the screen, press them. When you've pressed the fourth cross, your screen is calibrated.
In the terminal you will see some output which includes the “new calibration data”. This may be used to make the calibration persistent, as described below.
If you should experience any difficulties with calibration, it is worth typing
In the terminal, and consulting the options available. These include debug messages, listing input devices, and providing a pre-calibrated setting, detailed below.
1. Run the xinput_calibrator program as detailed above, and take a note of
the four “new calibration data” setting values that appear in the order:- min x max x min y max y
2. Insert the following into a startup script:
xinput_calibrator --precalib min_x max_x min_y max_y
Where the actual values written down earlier are substituted for the min_x etc
3. On rebooting, these values are used to configure the TouchScreen automatically.