conservative govenour problems on coreduo ibm t60

after echo conservative > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor is as far as i can see no scaling is active
and i got this (last time without lookup):

Oops: 0000 [#1]
PREEMPT SMP
Modules linked in: ibm_acpi ipw3945 ieee80211 ieee80211_crypt
CPU:    1
EIP:    0060:[<c039ff65>]    Not tainted VLI
EFLAGS: 00010293   (2.6.16-thinkpad-r3 #1)

EIP is at do_dbs_timer+0x3d5/0x4f0
eax: 00000000 ebx: c05eb254 ecx: 00000000 edx: c05eb254
esi: 0000000a edi: c194b240 ebp: 00000000 esp: c19cff08
ds: 007b es: 007b ss: 0068
Process events/1 (pid: 7, threadinfo=c19ce000 task=c19b0540)

Stack: <0>c05ac43c 0000000a 00000001 c05e9a20 00000001 c1977540 c1977540 f7c5e880
       4ae79880 c05539e0 c05539e4 c194b240 00000000 c01377dc 00000000 
c19cff54
       c01312d5 c194b268 c194b250 00000202 c039fb90 c19ce000 c194b250 
c194b258
Call Trace:
 [<c01377dc>] run_workqueue+0x7c/0x100
 [<c01312d5>] do_sigaction+0x1d5/0x220
 [<c039fb90>] do_dbs_timer+0x0/0x4f0
 [<c0138459>] worker_thread+0x169/0x190
 [<c011f9e0>] default_wake_function+0x0/0x20
 [<c01382f0>] worker_thread+0x0/0x190
 [<c013b9e2>] kthread+0xe2/0x120
 [<c013b900>] kthread+0x0/0x120
 [<c0101005>] kernel_thread_helper+0x5/0x10
Code: 00 00 00 e9 fa fd ff ff 0f bc c0 b9 0a 00 00 00 83 f8 0a 0f 4e c8 83 f9 09 0f 87 c5 fd ff ff 89 d3 8b 04 8d 20 e0 5e c0 8b 04 03 <8b> 40 1c c7 04 24 3c c4 5a c0 89 04 8d e0 98 62 c0 8d 41 01 89

best regards
Florian Manschwetus