I've got some new observations on this that might help narrow down the
problem.

(1) thermald
I've got thermald installed, and the default configuration seems to work 
*after* the standby/wakeup cycle. Before the machine goes into standby, the 
file cat /sys/class/thermal/thermal_zone0/temp constantly reads 40000 (40 °C), 
even when the processor is already way beyond 70°C (as monitored by lm-sensors' 
coretemp) so thermald doesn't trigger the CPU slowdown.

After the standby/wakeup cycle, this temperature reading follows the
coretemp, and thermald acts correctly.

It seems that whatever the secret windows sauce does, also happens after
a wakeup from standby. So maybe there's something I can do to automate
this behaviour during startup of the machine, not requiring human
intervention to enter "stable operation zone".

(2) apport-collect
When I run apport-collect and ignore its warning that submitting to the current 
bug is not recommended, the window it gives me lists as the first line 
"Package: linux (not installed)". I think it will not have collected all the 
info, but I'll send whatever it picks up and set the bug status to confirmed; 
maybe someone can help me operate it correctly or tell me to spawn a new bug 
with the apport-bug.

** Tags added: apport-collected trusty

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https://bugs.launchpad.net/bugs/728733

Title:
  fan only works when my acer 5315 is booted then stops

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