Hello,
I've successfully installed linux-image-2.6.25-1-generic, and run it in 
recovery mode (i.e. root shell, no X).
Executed sync; echo 1 > /sys/power/pm_trace; /etc/acpi/sleep.sh force  (it 
complains pm_trace doesn't exist; maybe it was removed in 2.6.25?)

Nothing changed, I still can do suspend-resume only once  :(

I've read https://wiki.ubuntu.com/UnderstandingSuspend. Since the
backlight doesn't turn on, I suppose it's something related to video
BIOS. My graphics card is an Intel X3100/GM965.

In the meanwhile, I've already upgraded the system BIOS from 1.19 to
1.34.

-- 
Acer Aspire 5720 hangs on second resume from standby
https://bugs.launchpad.net/bugs/160763
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