Enable hibernation

[Steve Langasek]

Hi Phillip,

On Fri, Dec 13, 2013 at 11:51:54AM -0500, Phillip Susi wrote:
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> Bug #812394 disabled the hibernate menu option by default.  Given the
> number of people commenting in the bug and the popularity of questions
> on askubuntu how to turn it back on, I believe this was a serious
> mistake and should be reversed.

> I would like the technical board to review any reasons for why this
> feature that many people rely on should not be enabled by default.

Now that the tech board has been reconsituted, I suppose we should address
this. :)

The hibernate menu option was disabled because it was exposed in many cases
where hibernate would not work reliably.  Indeed, I was recently trying to
make pm-hibernate work for me on the commandline in trusty (because my
machine seems to be in its death throes and suspend no longer works reliably
for me), and found that, even though I have a 6GB swap partition and 4GB of
RAM, I am consistently unable to hibernate here (I think kernel changes wrt
dm-crypt may be to blame).

I don't think we should have a menu option exposed by default which will
fail to work for a large number of users (in most cases, after first
churning the disk for a minute or two).  And at the time this decision was
made, there were not resources to make this menu option work *reliably* in
Ubuntu.

I know it's a feature that power users value, but I think the technical
rationale for removing the option was valid, and still applies today.  I
think a precondition for reintroducing the option to the menu should be to
resolve the reliability problems that led to its removal in the first place
(including the problem of systems having insufficient swap allocation), and
to get the buy-in from the kernel team (cc:ed) that it will be supportable
in the future.

Thanks,
-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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