When using the keyboard on my thinkpad x201, I cannot press left, up and space at the same time. That is, when I start pressing the keys one after the other, the third one will be ignored.I verified this with pygame, xev and evtest.How can this be fixed? I don't even know where to start debugging this.Update: The same thing happens when with either g, h, b, or n instead of space. But it works with other combinations, e.g. left+space+g.
left+up+space keys not working on thinkpad x201
keyboard;thinkpad
This is a hardware issue with Matrix keyboards. Vendors put them in notebooks and sell most of the keyboard with Matrix technology, because they are cheaper in comparison to most mechanical keyboards.If you try to push three buttons on your keyboard, which use the same data lines, one key might be ghosted.Wikipedia explains it very well: https://en.wikipedia.org/wiki/Rollover_(key)If you really need to push these three buttons or more, it is advisable to buy mechanic keyboard. Some of these connect to your pc as multiple keyboard. It is possible to push every button on the keyboard and it will be recognized.