Acer 4315: suspend to ram reboots on recover.
 

This laptop, under Ubuntu 7.10 and 8.04, will suspend fine with the logout menu option or the sleep key. Press any key to wake and the laptop reboots.

If no AC attached, it just shuts down.

Hibernate (suspend to disk) works properly.

Also posted to:
https://bugs.launchpad.net/ubuntu/+s...ux/+bug/225202
http://hbclinux.net.nz/acer4315-804.html

dmesg has no ACPI errors reported - a first for acers I've used.
Where else should I look?

Might be a good idea to try tuxonice. See tuxonice.net

Does TuxOnIce support suspend to ram? I thought they just did suspend to disk?

It does support suspend2disk.

In fact, they have a better type of suspend called suspend2both. (i.e) the system is first suspended to disk and then to RAM (together).

So the battery runs out you will have resume from disk (25 sec in my HP laptop)

If the battery has the power it will resume from RAM (< 5 sec)

Cool - tuxonice looks like a bunch of kernel patches right now. I'll have to investigate altering an OEM install CD to include them.

I have a suspend to both function already in this kernel (2.5.24). Suspend to disk already works. Suspend to both is what fails. Mind you, the cold-boot time (power on to useable desktop is 25-30secs anyway - the "instant up" provided by suspend-to-ram is nice.)

This leads to the possibility of implimenting a pseudo-suspend script - something that will shut down high-drain stuff (screen, wireless, what else?) and bring them back up... but not actually a full suspend. This would save power (not as much as a full suspend), be more easily implimented on systems with dodgy acpi (so it's better than nothing) and still provide that instant-on availability.

In other words - it provides the feeling of a suspend, with some of the advantages...