[ltp] the purpose or advantage of suspend and hibernation

[Alexander Gran]

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> There is even many variations of suspend: suspend to
> ram, suspend to disk, etc. What is it about?

Well suspend to ram lets only the rams alive. This takes nearly no power, a=
nd=20
suspending/resuming is fast, only few seconds depending on your kernel. It =
is=20
ok for offtimes of several hours, but not days.
Suspend to disk/hibernation writes all data from the ram to the harddisk.=20
Everything is powered off afterwards, this makes STD a solution for longer=
=20
periods. However, for people with a lot MBs, suspendung and resuming takes=
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really long. However it can still be faster than a reboot, as you don't nee=
d=20
to restart everything and open your files.

> Why not just shutdown and boot again when needed? It
> doesn't take _that_ long, unless of course you run a
> fashionable GUI Desktop (I don't).

My T40 boots in ca. 1 min (with KDE). Suspending takes ca 5 seconds.=20

> What are the advantages? Under what circumstances will
> they prove useful or perhaps even necessary? Do they
> save power or something like that? Nay! How can they
> compared to shutting down of powering off!?

Well, I don't have to restart all aplications, so if you are e.g. short on=
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battery power, you can suspend while fetching a coffee. A reboot takes way=
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longer.

> Disadvantages? Right now I cannot see the
> advantages... A couple of common sense comments could
> help out here, please.

disadvantages? Well it doesn't work always..

Alex

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