Thanks for the advice.
Unfortunately I don't completely understand what you mean with the
> Of course if some non trusted packages has also been installed, then
goto ubuntu archive.
For the moment I have purged xserver-xorg-video-intel without
reinstalling it (since I've seen that it is optional).
I cannot yet verify with certainty whether this solves the issue because
I haven't found a way to reproduce it in a deterministic way. That
said, after uninstalling xserver-xorg-video-intel, my virtual terminals
are visible again (which I hadn't mentioned in the original post because
I hadn't thought that this issue might be related). I will keep this
configuration until I either run into the original issue again or you
advice me to install the package again.
In case this was a misconfiguration on my side (don't know why the
optional package was installed): Sorry for filing a bug report.
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High CPU usage of /usr/lib/xorg/Xorg
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