System goes to S3 sleep three times

Package: pm-utils
Version: 1.2.2.1-0ubuntu1

(Package is just a guess. The problem might well be in the Linux kernel.)

Short Description: After pressing the Fn+Sleep button once, the system goes to S3 sleep three times ([1], [2], [3]). It should do this only once.

Long Description:

Using Ubuntu jaunty (current) on an IBM Thinkpad x200s (amd64), when I press the Fn+Suspend button on the keyboard to put the system in S3 sleep, it falls asleep after a few seconds. While falling asleep, the “Sleep” LED blinks; when finished, the “Sleep” LED is lit permanently [1].

After a few minutes, I wake the system. It wakes up, the “Sleep” LED goes off, and I can see the gnome-screensaver lock screen appears. That should be all. [A] However, instead of nothing else happening, the lock screen disappears after about a second, the “Sleep” LED starts blinking again and the system successfully goes to sleep [2].

So, I wake the system up again, by pressing the power button. It wakes up, the “Sleep” LED goes off, and I can see the gnome-screensaver lock screen appear for about a second. Then the “Sleep” LED starts blinking again and the system successfully goes to sleep [3].

Now, when I wake the system again with the power button, it wakes up, shows the gnome-screensaver lock screen and this time stays in that state, as it already should have after [A].

From the kernel log (Lines containing "PM:"):

Dec 14 21:25:54 isis kernel: [33333.059940] PM: Syncing filesystems ... done.
Dec 14 21:25:54 isis kernel: [33333.287401] PM: Preparing system for mem sleep
Dec 14 21:25:54 isis kernel: [33333.288384] PM: Entering mem sleep
Dec 14 21:25:54 isis kernel: [33334.644146] PM: suspend devices took 1.356 seconds
Dec 14 21:25:54 isis kernel: [33337.980291] PM: resume devices took 2.812 seconds
Dec 14 21:25:54 isis kernel: [33337.980314] PM: Finishing wakeup.
Dec 14 21:26:06 isis kernel: [33344.014381] PM: Syncing filesystems ... done.
Dec 14 21:26:06 isis kernel: [33344.200250] PM: Preparing system for mem sleep
Dec 14 21:26:06 isis kernel: [33344.220556] PM: Entering mem sleep
Dec 14 21:26:06 isis kernel: [33345.568142] PM: suspend devices took 1.348 seconds
Dec 14 21:26:06 isis kernel: [33348.516046] PM: resume devices took 2.536 seconds
Dec 14 21:26:06 isis kernel: [33348.516071] PM: Finishing wakeup.
Dec 14 21:26:21 isis kernel: [33354.725428] PM: Syncing filesystems ... done.
Dec 14 21:26:21 isis kernel: [33354.900524] PM: Preparing system for mem sleep
Dec 14 21:26:21 isis kernel: [33354.901416] PM: Entering mem sleep
Dec 14 21:26:21 isis kernel: [33356.236142] PM: suspend devices took 1.336 seconds
Dec 14 21:26:21 isis kernel: [33359.504311] PM: resume devices took 2.748 seconds
Dec 14 21:26:21 isis kernel: [33359.504334] PM: Finishing wakeup.

(timestamps are all from after resume, the system was put to sleep at approx. 21:13)

kosh@isis:~$ uname -a
Linux isis 2.6.28-2-generic #3-Ubuntu SMP Thu Dec 4 21:49:26 UTC 2008 x86_64 GNU/Linux

System has 4GiB RAM, 5GB swap, / and /home are ext4, /boot is ext3.