[Oops] ACPI problem with 2.6.0-test11 on Asus L3800C

["David Gümbel" <david.guembel@gmx.de>]

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I have recently installed 2.6.0-test11 on my Asus L3800C laptop. One thing I 
stumbled across was that it is no longer possible to set the CPU 
performance via ACPI. It worked fine with 2.4.21 with acpi-patch applied.
The behaviour is reproducible, i.e. it happens every time I try to set the 
performance. Symptoms are as follows:

When executing 'echo 1 > /proc/acpi/processor/CPU0/performance', I got the 
following (visible via dmesg):

-------------------------------------------------------------------------
Unable to handle kernel NULL pointer dereference at virtual address 00000030
 printing eip:
c0115b3d
*pde = 00000000
Oops: 0000 [#1]
CPU:    0
EIP:    0060:[<c0115b3d>]    Not tainted
EFLAGS: 00210202
EIP is at acpi_processor_write_performance+0x12d/0x17f
eax: 00000020   ebx: cf62d2a0   ecx: dfd4d3a4   edx: dfd4d3c4
esi: 00000000   edi: 00000002   ebp: c734bec4   esp: c734beb0
ds: 007b   es: 007b   ss: 0068
Process bash (pid: 10637, threadinfo=c734a000 task=d1cb26a0)
Stack: c734bec4 00000000 00000000 c13d3038 c01452e0 00000000 001e8480 
00124f80
       000000fa 00124f80 001e8480 000007d0 00000000 c042cd40 00000000 
00000000
       dfd4d3ac dfd4d3ac 00124f80 001e8480 00000000 c042cd40 dfd4d3c8 
66757063
Call Trace:
 [<c01452e0>] do_anonymous_page+0x138/0x21f
 [<c0152d6e>] vfs_write+0xbc/0x127
 [<c0152e7e>] sys_write+0x42/0x63
 [<c010b31b>] syscall_call+0x7/0xb

Code: 8b 48 10 b8 e8 03 00 00 89 2c 24 f7 e1 89 44 24 28 e8 42 a8

-----------------------------------------------------------------------

I attached my $(grep ^C .config) and the output of dmesg and lsmod. The 
Cisco Modules that taint the kernel (see dmesg file) do not change the 
behaviour. dmesg output contains the described error twice, the first time 
triggered by the KDE laptop daemon, and the second time by a cat as 
described. Above output was taken from a untainted kernel instance (but I 
need those Cisco modules for internet connectivity ;)

If any information or tests are needed, I will be happy to provide / run 
them ;)


Greetings



David

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