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My System: Arch 4.8.8-2 Gnome 3.22.2 Graphics card: Radeon HD7770 Graphics driver: radeon (xf86-video-ati-1:7.5.0-1)

Since I did an update, my screen freezes after some time, most of the time when starting a video or opening an additional tab in Firefox... Since the beginning of this problem, I suspect a video problem...

I already read some stuff, and one solution was to change the Pointer Theme. I was a bit hesitating, but indeed it solved it a bit, it took much longer before the screen froze again. However, when doing some "intense" stuff, it still freezes.

I looked at the systemd journal, and found nothing specific at the time the screen freezes...

I can get out of the freeze by doing killall -HUP gnome-shell through a remote SSH session. Switching to another terminal (CTRL-ALT-F2) does not do anything...

Does anybody know what I have to do to solve this?

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This is more of a comment than an answer. I had faced a similar situation in Ubuntu and Debian. In my case turned out that upgraded kernel (4.6 in my case) was for some reason not working correctly with my Intel graphics card causing the screen to freeze randomly. Quite strange since previous kernel (4.4) and next kernel (4.7) had not this problem.

If your last update was including a kernel upgrade you could boot with an older kernel to see how it goes.

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