Binary package hint: acpi
I have a Fujitsu Siemens Esprimo u9200, and it seems nearly all acpi stuff works: suspend, hibernate, events when closing the lid and gnome-power manager knows when the laptop is running on battery, when it's charging or when it is pluged in with missing battery or fully charged.
But there's one thing that bothers me: while gnome-power-manager 'seems' to be working correctly, the battery applet doesn't. It always shows the laptop being on running on ac power. In terminal, acpi -a -b shows the following:
patrick@patrick-laptop:~$ acpi -b -a
Battery 1: charged, 41%
AC Adapter 1: off-line
This happens with both ubuntu stock kernel and a .26 kernel. I suspect it could be some BIOS stuff, but I'm not sure. I've read the DSDT and it points to different places wether it's a linux OS, windows XP, windows XP SP1, SP2 or Vista. I've tried to recompile it pointing linux to the same place as all other options, but it still shows the same.