I have the same bug at my Acer V5-571G, Ubuntu 13.04, kernel
3.5.0.29-generic (signed image, UEFI & secure boot).
Some people at Arch wiki suppose that the problem seems to arise from
incorrect work of pm-utils. I am not sure of that, but if I write value
'on' into '/sys/bus/*/devices/*/power/control', the kernel takes control
over power management at the specified devices, and somehow this makes
the hardware to shut down correctly in my case.
(I have created a shutdown script like:
#!/bin/bash
case "$1" in
stop) for i in /sys/bus/*/devices/*/power/control ; do echo on > $i ;
done
;;
esac
exit 0
and that fixed my problem.)
Hope this helps.
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https://bugs.launchpad.net/bugs/1083386
Title:
System reboots instead of shutdown.
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