Comment 24 for bug 1010608

I hadn't checked back here in quite a while but as noted above I have found too this is still an issue in LM 14 MATE 64-bit.

I didn't know about the added scripting option(s). Instead I've been editing/commenting out the last line in the /etc/acpi/powerbtn.sh file like so:

#/sbin/shutdown -h now "Power button pressed"

Save file/exit.

This simple mod has worked for me in both LM 13 and LM 14, preventing an immediate shutdown from a power button press and instead yielding a prompt for further action(s).
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