the problem seems to be related with the acpi battery module of the kernel. Even though it seems loaded, when I look for it in lsmod, acpi reports nothing when executed on the command line.
However, when I
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sudo rmmod battery
sudo insmod /path-to-acpi-modules/battery.ko
it loads, acpi reports the status of the battery and the battery applet / extension appears after a few seconds. Of course, I could just do a little start-up script to do the above steps, but that should not be necessary. I wonder which other acip modules don't load properly without me noticing it.
I tried to add "battery" to /etc/modules. No difference! I also played with some acpi kernel boot parameters, no difference. Tried that with the "standard" LMDE kernel 3.2 and the debian experimental kernel 3.8, same thing.
I have a dual boot with Bodhi on the machine. There acpi works as expected, so it's probably not a BIOS issue.
Anyone can hint me into the prope direction?
Thanks and cheers, Riko