So now I tried tracing with the quirks I used back then:

$ sudo -i
# sync; echo 1 > /sys/power/pm_trace; pm-suspend --quirk-vbe-post 
--quirk-vbemode-restore --quirk-save-pci

result:
- system goes to sleep
- in wake up:
  - hdd-led flashes
  - caps-lock can be toggled
  - no video, blinking led indicates no wireless connection
  - but otherwise the system seems to be working:
    - screen flickers when changing tty with ctrl-alt-F[1-7]
    - blindly login in and entering "sudo /etc/init.d/gdm restart" audibly 
restarts gdm
    - blindly dumped dmesg into dmesg.txt


** Attachment added: "dmesg.txt"
   http://launchpadlibrarian.net/24466442/dmesg.txt

-- 
[Acer TravelMate 4000] suspend/resume failure during wakeup
https://bugs.launchpad.net/bugs/350351
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