>> Does anybody know whether this is solved by using an external video card?
My thoughts would be to first try tweaking features/options for your video card in xorg.conf. What kind of video card is in the computer? Information can be gotten from: # lspci (from a shell prompt, and see what kind of video it has), but better yet is to look at the output of " less /var/log/Xorg.0.log". Note that once you figure out what Xorg video driver is being loaded, you should be able to do: # man <video driver> Examples: man intel man nouveau man radeon And get a list of options that you can use to try to get more stable operation. Finally, what OS version are you using, what version of Xorg, What version of the Linux Kernel? Also note that many video systems, such as ones that are/were considered "high performance" tend to "wear out" (or wear out the power supplies driving them) because they take lots of power, and make lots of heat, so therefore are often short-lived. PS: I have been running on a couple if different variations of Intel integrated video system from the last few years just fine.
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