[arch-general] Suspend to RAM -- reboots instead of resuming

[Stephen Wilkinson]

Hello All,

I recently put a new SATA drive in my computer and decided to start
with a fresh install of Arch. Before this upgrade, suspend to RAM
worked fine (although I don't know if it was with kernel or uswsusp).
(I should say, I'm not sure if the SATA upgrade is a cause of my
problem or simply a coincidence)

Although I copied my /etc/suspend.conf and /etc/pm from the old drive
I must be missing
something because it's not working anymore (nothing else apart from
the hard drive has changed). When I do pm-suspend, the computer
correctly powers down and the power LED goes from green to orange...
when I wake up the computer however, instead of resuming, it reboots.

So far, I've tried the following:
echo mem > /sys/power/state: suspends, reboots instead of resuming
pm-suspend --auto-quirks: suspends, reboots instead of resuming
s2ram -n: tells me the system is unknown
s2ram -f: suspends but reboots instead of resuming
s2ram -f -a 3 and other variations: same, reboots instead of resuming

The pm-suspend.log file is not very helpful -- it shows that the
computer correctly suspends, but the last entry is "performing
suspend" and there's no information on resume of course because the
computer restarts instead of resuming.

To rule out modules, I tested a minimal setup explained in the SUSE doc:
* edit the grub kernel command to start only bash: init=/bin/bash
* mount /sys and /proc by hand: mount /sys && mount /proc
* manually suspend to RAM: echo mem > /sys/power/state
Again, the power LED goes orange, but when I wake up the computer it restarts.

I've tried different BIOS settings in case I had accidentally changed
something there, but it made no difference.

It seems the resume hook isn't working -- even though I
re-mkinitcpio'ed the kernel images with the resume hook (also tried
the uresume hook -- I'm a bit confused about this, though I think
uresume is for uswsusp and resume for kernel suspend).

Is there a way of seeing what happens when the wake-up event occurs? I
tried adding a hook in /etc/pm/sleep.d for the resume event, but of
course it's not reached, so I get nothing out.

Any suggestions on how to debug this issue further would be much
appreciated. I've been staring at the problem so long that I might
have missed something obvious...

Steve

Hardware:
MSI MS-6741 VIA K8T800 Socket 754 Motherboard
Seagate SATA hard drive
Kernel 2.6.30.6-1