I have similar problems on the same laptop.
1. resuming from suspend the image on the screen flashes
2. on 9.04 I solved by adding those lines in /etc/pm/config.d/00sleep_module
ADD_PARAMETERS="--quirk-vbe-post --quirk-vbemode-restore 
--quirk-vbestate-restore"
I upgraded to 9.10 and the problem 1. is still present.
If I do the modification of point 2 the system hangs during resume.

I can attach any log if needed, please, just tell me what you need.
Thanks

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[Acer Aspire 5100] suspend/resume failure
https://bugs.launchpad.net/bugs/405443
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