Question
When I move the pen on my X220T near the edge or especially near corners and cursor just runs away from pen tip towards that edge. In the most affected corner, pen movement of about 1-2 mm causes cursor movement of about 5 mm. It is also slightly dependant on the angle at which I'm holding the pen. If I hold it perpendicular to the screen, then issue becomes less pronounced.
When trying to draw straight lines, the line appears deflected when drawn at certain points of the screen. This is most easily demonstrated when drawing diagonal lines with a straight edge.
Answer
Updated Digitizer Firmware has been released that should address pen accuracy once installed and the calibration run again. Customers report success with 4 and 16 point calibration in forum discussion..
This has also been released as a formal tip on the Lenovo Support site here
Please go through the readme file before installing the firmware.
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WHAT THIS PACKAGE DOES
This utility will examine your system configuration and detect supported
digitizer device installed in your ThinkPad X220 Tablet.
The utility will then check the firmware version of the ditizer and judge whether
your system requires a firmware update or not. If required, an update button will
be enabled to run the firmware update program for your digitizer.
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CHANGES IN THIS RELEASE
Release fwdigi01
<Fix>
Improved accuracy of the digitizer.
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MAKING A DOWNLOADED FILE TO USE
This section assumes to use Internet Explorer and Windows Explorer.
Downloading file
1. Click once on the underlined file name. Once this is done, some pop-up
windows will appear.
2. Follow the instructions on the screen.
3. In the window to choose Run or Save, click the Save button.
4. Choose the folder you would like to download the file to and click the Save
button.
A different window will appear and the download will begin and complete.
Once the download has completed, there may or may not be a message stating
that the download completed successfully.
Extracting the Digitizer Firmware Update Utility
5. Locate the folder where the file was downloaded.
6. Double click the file saved.
7. Copy "fwdigi01.exe" to the located folder.
Finally delete the file saved in the step 4.
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INSTALLATION GUIDE
After the above sections "MAKING A DOWNLOADED FILE TO USE" have been completed,
follow these steps.
Please connect the AC adapter and use a fully charged battery to power the
ThinkPad system during the update. This will avoid an accidental loss of power.
1. Run the "fwdigi01.exe".
2. The update utility examins a digitizer firmware version and judges update
required or not.
3. If your digitizer firmware needs to be updated, the update button is able to push.
If not, you can push the exit button only.
4. Follow the instructions on the screen to update the firmware.
The update utility updates the firmware and verifies it.
5. When the update is completed, press the exit button to end the Firmware Update
Utility.
6. Shutdown and power on again.
7. Finally delete the update utility.
Attention: Please do not power off the ThinkPad during the firmware update,
or your digitizer may NOT be usable anymore.
Notes:
- The Digitizer Firmware Update Utility does not support a suspend/hibernation/
resume feature of the ThinkPad while the firmware update utility is running.
Please do not use Fn-F4, close LID or equivalent functions.
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Firmware here
Readme here
