I wonder why I can reproduce it on three computers with two ubuntu versions, with both Nvidia and Intel and you cannot (post #6)... Just in case it might matter, I have other desktop environments (Plasma, xfce) also installed, but my session manager is set to gdm.
Additional info: I have a third computer which is still on 17.10 with Nvidia graphics, and it also sports the same kind of buggy behaviour as my post #8, so it seems this might be inherited from at least one prior version. I reported the bug and assigned it to gdm because, well, when the computer is apparently dead (step 3 in #8), if you SSH and do sudo pkill gdm, then it dies, respawns and things go back to normal, no need to reboot via REISUB when another computer is at hand.
Yes, both are on 18.04.
I wonder why I can reproduce it on three computers with two ubuntu versions, with both Nvidia and Intel and you cannot (post #6)... Just in case it might matter, I have other desktop environments (Plasma, xfce) also installed, but my session manager is set to gdm.
Additional info: I have a third computer which is still on 17.10 with Nvidia graphics, and it also sports the same kind of buggy behaviour as my post #8, so it seems this might be inherited from at least one prior version. I reported the bug and assigned it to gdm because, well, when the computer is apparently dead (step 3 in #8), if you SSH and do sudo pkill gdm, then it dies, respawns and things go back to normal, no need to reboot via REISUB when another computer is at hand.