I tried the modeset change first, as that one we'd presumably prefer to
be true anyway one day, whereas giving stuff root that isn't supposed to
have root never feels right. :-)
It worked. I left it to display sleep for a couple of minutes and on
wake I came right back to the desktop. (I don't have screen lock on, so
no password needed.)
In case the length of sleep makes a difference (don't know why it
should) I'll leave it to cut in normally when I go out for a couple of
hours shortly, and see what happens when I get back.
NB: I had tried enabling this before as part of forcing nvidia to use
wayland. I disabled it because (in Wayland) it was terribly sluggish and
in the logs I was seeing nvidia_drm panic and presumably relaunch almost
continuously, on the 4.13 kernel. Nouveau was also failing on that
kernel, even worse, giving just a black screen. That was when I decided
to try harder to have a working Xorg system again. :-) But I hadn't
tried turning modeset on and still use xorg; I didn't know there was a
point in doing so. It seems to be happy.
BTW FWIW
rachel@fleetfoot:~$ apt-cache policy nvidia-384
nvidia-384:
Installed: 384.90-0ubuntu0~gpu17.10.1
Candidate: 384.90-0ubuntu0~gpu17.10.1
Version table:
*** 384.90-0ubuntu0~gpu17.10.1 500
500 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu artful/main
amd64 Packages
100 /var/lib/dpkg/status
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https://bugs.launchpad.net/bugs/1720149
Title:
gnome-shell segv on wake from display or system sleep
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