weird ACPI problem

Hi ACPI Gurus ...

I have a weird ACPI related problem with my ACER C100 Laptop/TabletPC.

I'd like to install Gentoo Linux on it and everything seems to work flawlessy except power management, namely ACPI. I tried a number of different kernel versions (including 2.6.11.7 and 2.6.12-rc3 with ACPI patches from acpi.sourceforge.net), configs and parameters but nothing helped, the dmesg output always says "ACPI: Interpreter disabled", no matter what I tried.

The strange thing is that ACPI works like a charm if I boot KNOPPIX from my external DVD drive. I compiled the same kernel version Knoppix is using and I used the same config (only added ReiserFS and the RTL8139 driver for my NIC) but still no improvement. Klaus Knopper (creator of Knoppix) told me that he is using a vanilla kernel version 2.6.11 from kernel.org and I even tried that one, nothing seems to help. A small number of other Acer C100 Linux users joined me, as no one has a working ACPI enabled kernel up and running, despite the fact that Knoppix runs fine.

It would be really appreciated if you could join the numerous people trying to help me, I opened a thread in the Gentoo forum where all my tries and log files etc. can be reviewed
(http://forums.gentoo.org/viewtopic-t-331266.html).

Of course I can prepare a report of what I tried and what the results were here on the list, if you prefer that.

Thanks in advance for any hints or tips,

kind regards,
Heiko

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