I have quickly investegated my BIOS settings. Under power management there is a
field "ACPI Standby State" with options:
-> S1 (POS)
-> S3 (STR)
-> Auto
The option that was selected was S1. With option S3 or Auto selected
then the suspend button correctly appears and the system correctly
works. With option S1 selected then the suspend button is not displayed.
According to Wikipedia. The state S1 means "All processor caches are
flushed, and the CPU(s) stop executing instructions. Power to the CPU(s)
and RAM is maintained; devices that do not indicate they must remain on
may be powered down". Shouldn't Ubuntu (or Linux in general) support
this (less energy saving) version of suspend?
** Changed in: gnome-power-manager (Ubuntu)
Status: Incomplete => Confirmed
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Missing suspend button
https://bugs.launchpad.net/bugs/336272
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