Suspend works on ac but not on battery [lenny/sid]

I've noticed that sleep mode works fine on on AC , but when sleeping on battery my Fujitsu-Siemens never wakes. I have laptop mode enabled(also on ac) all the time and acpi support installed with vbe and ati events enabled. What can be a reason? What is the difference between work on battery and on ac? Unplugging charger while debian is working and then suspend didn't help.

my kernel(from debian repository) Linux kaladan 2.6.24-1-amd64 #1 SMP Mon Feb 11 13:47:43 UTC 2008 x86_64 GNU/Linux

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Pozdrawiam

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