AC Adapter ACPI error

[Sutter Cain]

Hello,
on my Laptop (running 2.6.32.9-70.fc12.x86_64) the AC Adapter is not recognized properly with acpi.

dmesg | grep linux returns:

ACPI Error (psargs-0359): [\_PR_.CPU0._PPC] Namespace lookup failure, AE_NOT_FOUND
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.ADP0.ADJP] (Node ffff88013ba615e0), AE_NOT_FOUND
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.ADP0._PSR] (Node ffff88013ba615a0), AE_NOT_FOUND
ACPI Exception: AE_NOT_FOUND, Error reading AC Adapter state (20090903/ac-140)

I read that this is a kernel problem and it could work if the ac adapter is compiled as a kernel module.

Is there a fix anywhere? I don't like to comile a new kernel, therefor I don't feel certain enough

[MicroKernel]

Hello Sutter Cain,
yeah this is probably an issue related to the kernel you are using, I observed the same problem with my laptop since Fedora 12. I am using the latest kernel and it does not appear to have been patched yet.

Anyway if you want to give the kernel customization a try here there is some instructions (and a link to the fedora official guide to recompile your kernel).

If you are not practice with kernel customization here is the official fedora link with all the instructions: http://fedoraproject.org/wiki/Docs/CustomKernel

Once you've executed the make menuconfig go to:

Power management and ACPI options --->

Then to:

ACPI (Advanced Configuration and Power Interface) Support --->

Now set AC Adapter as a MODULE instead of being compiled within the kernel itself as follow (it should appear like this <*> AC Adapter, to change it use the space bar once your cursor is over the option):

<M> AC Adapter

At this point exit and save your .config file and keep following all the instructions on the link above to build your custom kernel.

Once you've installed your new kernel (please remember that to install a kernel you MUST use rpm -ihv <kernel rpm files list with firmware and kernel>) reboot and check if now your AC Adapter is correctly detected by ACPI.

If so you are ok, the last thing you have to do is to disable kernel updates via yum (and then keep updating your kernel manually, to me this is not an issue because i customize my kernel also for other things), or you will loose all the work at the next update from Fedora, this due the fact that, for now, the fedora team keep compiling the standard kernel with AC Adapter inside the kernel itself and not as a module.

Hope this help!
Regards,
Paolo