> A touchscreen adds another input mechanism. You got me an insight!
I looked for how block the touchscreen. I found [1] and have blocked it. The issue got away. But, I do not known if the problem was with the hard or a software bug. In any case, I do not remember a day that I have been used the touchscreen. So, in this mean time, it is not necessary. 1. https://askubuntu.com/a/1011125/231727 Thank you all for helped me in this issue! -- Marcelo
