I asked our desktop team about this, and Iain Lane mentioned that Ubuntu
overrides the GNOME default of auto-suspending, but that override only
takes effect if you have the ubuntu-settings package installed. I tested
this out on a Saber system, and I can confirm that it does seem to only
happen when gdm is installed/running and ubuntu-settings is *not*
installed. And that explains why I was unable to reproduce in Comment
#5. There I had installed ubuntu-desktop which would bring in ubuntu-
settings. It also explains why the CUDA-11 dependency chain *did* cause
the problem on the x86 server in Comment #8. In that case, gdm3 is
getting installed as a Recommends somewhere in the dependency chain -
but it does not pull in gnome-settings.
I'll therefore go ahead and close the 'linux' task as Invalid - this
isn't a kernel bug. I'll mark the gdm3 bug as "Won't Fix" because, in
theory, we could change the defaults inside of gdm3 itself - but we
instead recommend users install ubuntu-settings to override the
defaults.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
** Changed in: gdm3 (Ubuntu)
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/1862559
Title:
ubuntu 19.10: unresponsive/freezes on ThunderX2 if system is idle for
~22min
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