This page is for exploring issues encountered with the Lenovo MT hardware. Once we're capable of formulating these into actual tickets/bugs in Launchpad, we will do so.
Touch Area
The first big problem I have noticed with the MT-enabled T410s is that the touch area is not equally sensitive at all points. Using gesturetest to get touch feedback, below I have roughly plotted the responsiveness of light touches across the screen. The "O"s represent a successful touch and the "-"s represent a touch that did not result in any feedback.
Light-pressure Touches
O O O - - - - - - - - - - - - - - - - - - - - O O O - - - - - - - - - - - - - - - - O - - - O - O - O - O - - - - - - - - - - - - - - - - O - - O O - - - - - - - - - - - - - - - - - - O O O O - - O - - - - - - - - - - - - - - - - O O O O - - - - - - - - - - - - - - - - - - - O O O O - - - - - - - - - - - - - - - - - O - O O O O O O - - O - - - - - - - - - - - - - - O O - - O - - - - - - - - - - - - - - - - - - O O O - - - - - - - - - - - - - - - - - - O - O - - - - - - - - - - - - - - - - - O O O O O O O O - - - - - - - - - - - - - - - O O O O O
Medium-pressure Touches
O O O O O O O - - - - - - - - - - - - O O O - O O O O O O - - - - - - - - - - - - - O - O - O O O O - O - - - - O - - - - - - - - - - - - O O O - - O - - O - - - O - - - - - - - - - - O O O O O O O O O - - - - - - - - - - - - - - O O O O O O O O O - - O O O - O - - - O O O O O O O O O - - - O O - - - O - - - - - - O - - O O O O - - - - - - - - - - - - - - - - O - - O O O - - - - - - - - - - - - - - - - - - - - O O O O - - - - - - - - - - - - - - - - - - - O O O - - - - - - - - - - - - - - - O - O O O O - - - - - - - - - - - - - - - O O O O O O O
Heavy-pressure Touches
With enough pressure and duration of a gesture, all areas of the screen respond to touch. See conclusions below.
Conclusions
After performing these screen tests and some more experimentation, the following observations were made:
- all areas of the screen will provide a touch response as long as
- the pressure is great enough (sometimes a lot of pressure is required), and
- the contact is held long enough
- some areas of the screen just need a quick, light press
- some areas of the screen need to be pressed hard and held for as long as a second
- all areas of the screen responded after one second (with enough pressure applied)
- Windows has a similar issue on the T410s, but it is much, much less noticeable -- it's a mild responsiveness annoyance, rather than a glaring issue
- as such, there is a definite issue in Linux with this particular piece of hardware
Note that a ticket was filed about this issue:
- After calibration, the hardware began operating normally and this ticket was marked as invalid.
Here are instructions for calibrating N-trig-based devices on Linux.