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I'm ahving a Dell Inspiron 1525.

I installed there a stock Ubuntu 10. However I can see no "hibernate" item in the shutdown menu.

Is ACPI supported on 1525? If it is, how can I make hibernate work there?

Solved: my bad, swap wasn't on.

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Do you have a swap partition? Is it larger than your computer's RAM? –  Oli Aug 19 '10 at 8:24
    
@Yes, and yes. And either way I expect the "hibernate" option to appear. How can I verify that? –  Elazar Leibovich Aug 19 '10 at 10:01
    
@Oli, oof, I have a swap partition, but somehow it wasn't used... Having hibernate now. Sorry. –  Elazar Leibovich Sep 3 '10 at 6:36
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up vote 3 down vote accepted

Yes, ACPI should be supported on the Inspiron 1525 and hibernate should be available as an option on the shutdown menu. I don't own a 1525, but do own a variety of other similar Dells (1420, 1425, 1505) all of which have functioning (albeit sometimes buggy) hibernate.

It is possible the hibernate feature was disabled for the particular model due to bugs. That's really the only reason I could imagine it to be missing. For instance, it might be you have a proprietary driver loaded that can't do it.

If you're curious if ACPI is present at all, look in /proc/acpi.

If you want to check if hibernate works manually, the kernel command to enable it is:

echo -n 4 | sudo tee /proc/acpi/sleep

If that doesn't work then it's likely hibernate is either disabled or not supported. Check the ubuntu kernel bug reports for your card.

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