I am trying to set up swsusp on my laptop with Mandrake 9.1. It is a new machine and therefore supports ACPI only. Swsusp will work successfully only if I turn off ACPI by passing 'acpi=off' to the kernel at boot time.

I need ACPI because I will be using this laptop on battery frequently and need to know my power level. But again I also need swsusp to pick up where I left off when I need to shut down the machine.

If ACPI is enabled and I invoke swsusp, upon resume the machine will give me the X login prompt after a LONG wait. It does not run the resume script. I am using kernel 2.4.22-9mdk which appears to have simply stable version 1.0 of the swsusp patch. It also appears to have the acpi-option patch (I tried to add it and it said it had already been applied).

This is a bit frustrating so if anyone has any suggestions as to how to get ACPI and swsusp to play nicely, it would be much appreciated!! Thanks.

P.S. Just in case in makes a difference, the laptop is a Dell Inspiron 300m and being a Dell it needed a "hacked" DSDT table added to the kernel at compile time. The DSDT table is at: http://www.hoolehan.com/300mlinux/#acpi

That delay is from your system checking its filesystems for corruption. I've never used Mandrake, but I assume it has a sort of splash screen that prevents you from seeing a lot of text scrolling by in the background.

Have you read the kernel docs for software suspend support?

From the 2.6.0-test11 Docs (power/swsusp.txt):

"...it saves the state of the machine into active swaps and then reboots. You must explicitly specify the swap partition to resume from with "resume=" kernel option."

So, essentially, you need to add an entry in your grub.conf or lilo.conf that adds the kernel option "resume=/dev/(wherever your swap partition is)" ... That'll take care of that part of the problem.

I've never heard of a "resume script" ... as I understand it, the resume function is executed by the kernel, reading in a memory image from your swap partition. I doubt you should even see a splash screen.

But then, I've never run Mandrake. Can someone confirm?