Charlotte, that's a very interesting observation! I looked at it, and it
seems like the old acpi scripts are not used any longer. Instead, pm-
hibernate is used, which in turn reads /usr/lib/pm-utils/functions. Here
"platform" is hard coded. Our /etc/default/acpi-support is not read, and
there's no way to change this other than editing the hardcoding in the
script. BTW, I never edited /etc/default/acpi-support and I guess the
default setting there was "shutdown" for a reason. I wonder how many
laptops have broken hibernation now...

After replacing "platform" with "shutdown" in /usr/lib/pm-
utils/functions my laptop shut downs correctly on hibernation (and
resumes/thaws as it should).

The other bug #190095 talks about kernel versions, although that might
be wrongly attributed. In any case, my issue is pure user land.

-- 
hibernation fails to power off and reboots because "platform" is used instead 
of "shutdown"
https://bugs.launchpad.net/bugs/226069
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