Asus M6NE Battery problem with ACPI

[Dragonlord]

The M6NE has as many know a messed up BIOS. So far you had to use a patch to fix the broken ACPI tables on older kernels. On newer kernels this has been included already but for some reason only 1 of the two batteries do work ( although both are used by the laptop ). Any ideas what could be the problem?

Infos:
Linux 2.6.22-gentoo-r5 #2 PREEMPT i686 Intel(R) Pentium(R) M processor 1.50GHz GenuineIntel GNU/Linux

dmesg:

ACPI: AC Adapter [AC] (off-line)
ACPI: Battery Slot [BAT1] (battery present)
input: Power Button (FF) as /class/input/input0
ACPI: Power Button (FF) [PWRF]
input: Lid Switch as /class/input/input1
ACPI: Lid Switch [LID]
input: Sleep Button (CM) as /class/input/input2
ACPI: Sleep Button (CM) [SLPB]
input: Power Button (CM) as /class/input/input3
ACPI: Power Button (CM) [PWRB]
ACPI: Video Device [VGA] (multi-head: yes rom: no post: no)
ACPI: Invalid PBLK length [7]
ACPI: CPU0 (power states: C1[C1] C2[C2])
ACPI: Thermal Zone [THRM] (29 C)
Asus Laptop ACPI Extras version 0.30
M6NE model detected, supported

contens of /proc/acpi/battery: BAT1

As you can see there is only BAT1 recognized although it should be BAT0 and BAT1. One battery is stuck in the bay slot ( where the cdrom would go ). Could the kernel have a problem recognizing the battery in this bay there? Would be nice if my battery view would be working again.

[YoMo]

Hello,

I have an Asus M6Ne with the same problem. With my old kernel 2.6.19-r5 all it worked fine, BAT0 and BAT1. Now with kernel 2.6.22-r8 (not really far from the old one) the kernel doesn't recognize BAT0.
Did you find a solution?

thanks

[Bevan]

I've got an M6N and know the problem. Because the forum, in which the problem is discussed, is german, I will try to sum it up here:

The newest version of the BIOS includes a fixed DSDT, so everything should work correctly under linux. In kernel versions 2.6.20 up to 2.6.22 there is a bug that prevents the system from looking inside the DSDT during bootup to detect the battery. This is the reason, why systems with any of those kernels don't detect one of the batteries.

The problem seems to occur on M6N(e) and also W3N notebooks. Possibly also on others.

Here you can find a kernel patch that solves the problem: http://bugzilla.kernel.org/attachment.cgi?id=11724

Since version 2.6.23-rc3 of the linux kernel this patch is included and the problem is solved.

I hope I could help.

Michael

PS:
Here the official bug report at kernel.org: http://bugzilla.kernel.org/show_bug.cgi?id=8598
Here the original thread in a german forum: http://www.asusforum.encke.net/module-p ... -4710.html

[YoMo]

Here you can find a kernel patch that solves the problem: http://bugzilla.kernel.org/attachment.cgi?id=11724

Thanks, the patch really solve the problem! I've an Asus M6842NEUH and even with bios 0206 I can see BAT0 and BAT1.