Bug#909804: Excessive CPU usage at system startup

[Philip Hands]

Source: gnome-software
Followup-For: Bug #909804

Hi,

I am seeing what looks like this behaviour on a X230 with 4G RAM, most often on
resuming from suspend (I presume because the update job gets delayed while the
system is suspended and gets kicked of by systemd at resume).

Said machine is currently sitting next to me on the desk, completely
unresponsive (imobile mouse, apparently unable to negotiate WPA) and I'm leaving
it to see if it manages to got over the problem or just needs a power-cycle. The
disk activity LED is on solid. It was responding to pings over WiFi for a while,
but no longer.

My suspicion is that this occurs if one has a reasonable amount of swap already
in use when suspending. IIRC both Firefox and DrRacket were running on this
machine when it was suspended, which between them eat all the RAM.

If you can tell me how to provoke gnome-software into attempting an update in 10
minutes time, say, such that it will try it on resume if I wait till after that
time, then I'll be able to do that, suspend the machine, and perhaps be able to
provide you with a recipe for reporoducing the issue.

BTW I suspected it was gnome-software (or something in it's circle) that was
causing this when I noticed it about a year ago, so deinstalled that and IIRC
packagekit, and the problem went away -- it seems that I installed/upgraded
something recently that pulled them back in, and the problem is back. When the
machine is behaing itself I can probably give you versions and dates (they ought
to be recorded in etckeeper)

Cheers, Phil.