Suddenly, the screen turned into an abstract canvas and the beeping sounds - after turning it off and on - passed, what could it be?

Question

ubuntu

Yesterday, unexpectedly for myself, I decided not to upgrade from Windows 7 to Windows 10, but installed Ubuntu 20.04 Desktop.

But literally about 15 minutes ago, suddenly the screen turned into some kind of fractal-colored spots, and from the speakers (and maybe from the beeper) such a beeping-beeping began varied - like in science fiction films about hackers))

By long pressing the power button , and subsequent inclusion it was cured. The data doesn't seem to be lost. But now I want to understand what it was all about, and how to avoid it in the future.

Under Windows 7, everything worked fine, there were no blue screens, no crashes, nothing like that, i.e. This question is specifically for Ubuntu and not for hardware.

I assume that something is wrong with the drivers, but ... Video - integrated - this is a simple laptop on Intel 2000/3000 - drivers from the kernel, i915 - that is, I didn’t set anything up there at all - it was configured out of the box - and I didn’t touch it, I was even surprised - I usually set up Windows noticeably longer :)

The system crashed while working with VirtualBox, but I think it has nothing to do with it (well, for some reason it seems to me so).

In general, I will be glad to any advice-opinions. I don’t want to go back to Windows anymore))

Thank you in advance.

Answer 1

If there was a discrete video card, for example amd, then it could be attributed to it (the screen is covered with colored rectangles and stripes) or breakdowns due to long mining (problems with power chips), I have not heard of such Intel glitches.
ps For the future, if linux hangs, especially not due to nuclear problems, remember the key combination:
ctrl + alt + prnscr (release when you press the next key) +u / + s / + r, respectively, transfers all disks to r / o, starts forced synchronization of write buffers and reboots the machine
The key word is the correct unmounting of disks, there is no need to subject the file systems to unnecessary stress (power outage) if only the graphics subsystem is hung