I tried

echo 3 > /proc/sys/kernel/acpi_video_flags


And did a suspend. The screen goes black and then there is a lot of disk 
activity and the fan goes crazy. After about >5 mins the laptop goes into a 
suspend state. I was then able to wake from suspend. I haven't waited this long 
before so echo 1 or 2 might have got the same behaviour.

Haven't got time to try hibernate or anything else for the next two
days.

-- 
laptop does not suspend or hibernate
https://bugs.launchpad.net/bugs/164016
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