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.