It looks like -flicker-, but contrary to what I could find in Google, it is not to do with Chrome. It is the log-in screen already that shows up occasionally on the screen, and then the screen turns black again. This is the second, main, monitor to my Thinkpad T410s. On the built-in screen everything is fine. But it is so tiny, I do not use it. I also came across some random shutdown troubles during my search. I do not have any such. I would not say that the display flickers, rather the display shows up for spilt-seconds while the larger part of the time the display is simply black.

As last resort: How would I downgrade from here so that I can use the PC again, please?

Here is - on request - the output of lspci -k | grep -EA3 'VGA|3D|Display':

00:02.0 VGA compatible controller: Intel Corporation Core Processor
Integrated Graphics Controller (rev 02)
        Subsystem: Lenovo Core Processor Integrated Graphics Controller
        Kernel driver in use: i915
        Kernel modules: i915
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    Please edit your question and add output of lspci -k | grep -EA3 'VGA|3D|Display' terminal command. There is no way to downgrade. – Pilot6 Aug 17 '17 at 20:24
  • I don't know if this helps, or at least provides a chance to get closer: I have two of identically the same machines: T410s. Both sit on the identical dock. And the second one has an even larger resolution: 1920x1200. The second one, however, has no such problems at all. And: the output of the lspci -k | grep -EA3 'VGA|3D|Display' is also identical to the point. What else could I do to narrow down the difference that makes the difference? – udippel Aug 18 '17 at 9:06
  • Is any VGA-DVI or similar adapter used? – Pilot6 Aug 18 '17 at 9:38
  • In both cases I use the digital output of the docking station. In both cases the hardware hasn't changed at all. Just upgrading the software. – udippel Aug 18 '17 at 13:19
  • 1
    Please don't post additional information to comments. edit your question and post it there. – Pilot6 Aug 18 '17 at 17:40

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