There are several boot options to tweak your systems powermanagment (actually they all reduce the full functionality, but somtimes this helps):
Have a look at the kernel messages during boot (var/log/boot.msg) to see if ACPI returns error messages.
Maybe it helps to replace the powermanagment daemon powersaved by acpid (can be done via Yast). Note that you shouldn't run them in parallel.
And there are great sites about linux on laptops:
And this site seems to be most interesting: