A little bit more research yeilds, that it is only when the battery is 
in when the oops occurs.

System is

	Dell i8200/BIOS A7/two batteries/Debian/2.4.20 - from debian

Modprobe works.

	# modprobe battery
	ACPI: Battery Slot [BAT0] (battery absent)
	ACPI: Battery Slot [BAT1] (battery absent)

So that worked.

Lots more below, so I will finish the body of the email here.  I have 
attached my dsdt (since that seems to be the norm).  If there is 
anything else that I can do, give me an email.

Matt


Insert battery...  Kernel Oops

     ACPI-0189: *** Warning: Buffer created with zero length in AML
Unable to handle kernel NULL pointer dereference at virtual address
00000010
  printing eip:
c016d13a
*pde = 00000000
Oops: 0002
CPU:    0
EIP:    0010:[<c016d13a>]    Tainted: P
EFLAGS: 00210246
eax: 00000000   ebx: 00000000   ecx: cff38400   edx: c033b478
esi: cf1dbc00   edi: cff346c0   ebp: c87acd40   esp: c78c3d40
ds: 0018   es: 0018   ss: 0018
Process kacpidpc (pid: 19941, stackpage=c78c3000)
Stack: c27dde00 c87acd40 00000000 c5ab55b4 c016d227 c87acd40 c87acd40 
00000000
        00000000 c01755c4 c27dde00 c5ab55b4 c5ab5400 c5ab5400 00000010 
00000000
        c0175661 c5ab55b4 c5ab5400 c5ab55b4 00000000 c016da06 c5ab55b4 
c5ab5400
Call Trace:    [<c016d227>] [<c01755c4>] [<c0175661>] [<c016da06>] 
[<c016df70>]
   [<c017ad75>] [<c01804f4>] [<c018169b>] [<c017f759>] [<c016ef99>] 
[<c017b13a>]
   [<c017ba56>] [<c017813b>] [<c01780be>] [<c0177f85>] [<c01804f4>] 
[<c0180577>]
   [<c017966c>] [<d1a29d76>] [<d1a290d3>] [<d1a29d76>] [<d1a29d68>] 
[<d1a293bc>]
   [<d1a29b71>] [<c016fb9d>] [<c016b626>] [<c0105578>] [<c016fb38>]

Code: 89 68 10 57 e8 1d e7 00 00 6a 37 e8 b2 e4 00 00 89 c7 83 c4


Running this through ksymoops.

EFLAGS: 00210246
eax: 00000000   ebx: 00000000   ecx: cff38400   edx: c033b478
esi: cf1dbc00   edi: cff346c0   ebp: c87acd40   esp: c78c3d40
ds: 0018   es: 0018   ss: 0018
Process kacpidpc (pid: 19941, stackpage=c78c3000)
Stack: c27dde00 c87acd40 00000000 c5ab55b4 c016d227 c87acd40 c87acd40 
00000000
        00000000 c01755c4 c27dde00 c5ab55b4 c5ab5400 c5ab5400 00000010 
00000000
        c0175661 c5ab55b4 c5ab5400 c5ab55b4 00000000 c016da06 c5ab55b4 
c5ab5400
Call Trace:    [<c016d227>] [<c01755c4>] [<c0175661>] [<c016da06>] 
[<c016df70>]
   [<c017ad75>] [<c01804f4>] [<c018169b>] [<c017f759>] [<c016ef99>] 
[<c017b13a>]
   [<c017ba56>] [<c017813b>] [<c01780be>] [<c0177f85>] [<c01804f4>] 
[<c0180577>]
   [<c017966c>] [<d1a29d76>] [<d1a290d3>] [<d1a29d76>] [<d1a29d68>] 
[<d1a293bc>]
   [<d1a29b71>] [<c016fb9d>] [<c016b626>] [<c0105578>] [<c016fb38>]
Code: 89 68 10 57 e8 1d e7 00 00 6a 37 e8 b2 e4 00 00 89 c7 83 c4


 >>EIP; c016d13a <acpi_ds_execute_arguments+8a/118>   <=====

 >>ecx; cff38400 <_end+fbdae78/104bead8>
 >>edx; c033b478 <acpi_gbl_acpi_mutex_info+98/a0>
 >>esi; cf1dbc00 <_end+ee7e678/104bead8>
 >>edi; cff346c0 <_end+fbd7138/104bead8>
 >>ebp; c87acd40 <_end+844f7b8/104bead8>
 >>esp; c78c3d40 <_end+75667b8/104bead8>

Trace; c016d227 <acpi_ds_get_buffer_arguments+23/34>
Trace; c01755c4 <acpi_ex_resolve_node_to_value+94/f0>
Trace; c0175661 <acpi_ex_resolve_to_value+41/50>
Trace; c016da06 <acpi_ds_resolve_operands+26/38>
Trace; c016df70 <acpi_ds_exec_end_op+100/260>
Trace; c017ad75 <acpi_ps_parse_loop+5ed/958>
Trace; c01804f4 <acpi_ut_update_object_reference+214/254>
Trace; c018169b <acpi_ut_release_mutex+7f/88>
Trace; c017f759 <acpi_ut_release_to_cache+89/94>
Trace; c016ef99 <acpi_ds_delete_walk_state+99/a0>
Trace; c017b13a <acpi_ps_parse_aml+5a/1b0>
Trace; c017ba56 <acpi_psx_execute+166/1c0>
Trace; c017813b <acpi_ns_execute_control_method+53/70>
Trace; c01780be <acpi_ns_evaluate_by_handle+86/b0>
Trace; c0177f85 <acpi_ns_evaluate_relative+b5/d0>
Trace; c01804f4 <acpi_ut_update_object_reference+214/254>
Trace; c0180577 <acpi_ut_remove_reference+23/2c>
Trace; c017966c <acpi_evaluate_object+114/1e0>
Trace; d1a29d76 <[battery]__module_author+0/2a>
Trace; d1a290d3 <[battery]acpi_battery_get_info+73/138>
Trace; d1a29d76 <[battery]__module_author+0/2a>
Trace; d1a29d68 <[battery]__module_kernel_version+8/16>
Trace; d1a293bc <[battery]acpi_battery_check+80/fc>
Trace; d1a29b71 <[battery]acpi_battery_notify+45/68>
Trace; c016fb9d <acpi_ev_notify_dispatch+65/74>
Trace; c016b626 <acpi_os_queue_exec+3e/50>
Trace; c0105578 <kernel_thread+28/38>
Trace; c016fb38 <acpi_ev_notify_dispatch+0/74>

Code;  c016d13a <acpi_ds_execute_arguments+8a/118>
00000000 <_EIP>:
Code;  c016d13a <acpi_ds_execute_arguments+8a/118>   <=====
    0:   89 68 10                  mov    %ebp,0x10(%eax)   <=====
Code;  c016d13d <acpi_ds_execute_arguments+8d/118>
    3:   57                        push   %edi
Code;  c016d13e <acpi_ds_execute_arguments+8e/118>
    4:   e8 1d e7 00 00            call   e726 <_EIP+0xe726>
Code;  c016d143 <acpi_ds_execute_arguments+93/118>
    9:   6a 37                     push   $0x37
Code;  c016d145 <acpi_ds_execute_arguments+95/118>
    b:   e8 b2 e4 00 00            call   e4c2 <_EIP+0xe4c2>
Code;  c016d14a <acpi_ds_execute_arguments+9a/118>
   10:   89 c7                     mov    %eax,%edi
Code;  c016d14c <acpi_ds_execute_arguments+9c/118>
   12:   83 c4 00                  add    $0x0,%esp


So hopefully that helps people a little bit more.


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