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Graphic glitch Debian 9




Hello.

I don't speak or write in English.

I want to know if it's possible to track down a graphic glitch that
don't let me live.

The problem:

A horizontal line appears on my screen for one second and disappear.

The glitch is random, happens twice per hour, maybe.

In two different pc happen, one of them has a screen with VA
technology, so i can see better the line (because has a lower refresh
time) connected through HDMI and the other is a IPS (DVI). One of the
systems use a Nvidia gpu with a AMD cpu and the other a Intel cpu and
gpu.

I can't take a screenshot, for the randomness of the problem, so i
made some examples and i find one picture (of a completely different
problem) that fits perfectly.

Examples:

https://flic.kr/p/S9ZbWW
https://flic.kr/p/QwMs4M
https://flic.kr/p/2cUggrx

The picture (the line is exactly like this):

https://i.stack.imgur.com/7Dk9K.jpg

I assume  the error happens when an event for the keyboard or mouse occur.

The applications present when this happen are:

xterm
tmux
emacs (in terminal mode)
moc
firefox
chromium

The OS is Debian 9, and the environments are XFCE and Openbox.

Previously i "fixed" a tearing problems on both systems, but this
specific problem continues.

Thank you.