eeePC 700 Celeron: ondemand and conservative governor didn't work

Since Karmic the scaling governor for the Celeron prozessor of my eeePC 700 (p4-clockmod) can not use the ondemand or conservative scaling governor. When I try to switch the kern.log puts out:

ondemand governor failed, too long transition latency of HW, fallback to performance governor

It is using the performance governor when pluged in and the powersave (meaning ~100 MHz) when on battery power, if p4-clockmod is loaded.

There are some bugs around with commends regarding this issue (#432706 and #433331) , but since the original reporters reported other issues I open this bug.

Especially interesting could be these comments even if some contradict each other:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/432706/comments/9
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/432706/comments/14
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/433331/comments/7
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/433331/comments/11

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-22-generic 2.6.32-22.33
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC662 rev1 Analog [ALC662 rev1 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC662 rev1 Analog [ALC662 rev1 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: user 1272 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf7eb8000 irq 16'
   Mixer name : 'Realtek ALC662 rev1'
   Components : 'HDA:10ec0662,104382a1,00100101'
   Controls : 13
   Simple ctrls : 8
Date: Mon May 31 21:19:26 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu-Netbook 10.04 "Lucid Lynx" - Beta i386 (20100406.1)
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.

 ppp0 no wireless extensions.
MachineType: ASUSTeK Computer INC. 701
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=caa48be3-4fb5-4873-a114-07710157c454 ro splash
ProcEnviron:
 PATH=(custom, User Name)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34
RfKill:
 0: eeepc-wlan: Wireless LAN
  Soft blocked: yes
  Hard blocked: no
SourcePackage: linux
WifiSyslog:
 May 31 21:07:21 silagu kernel: [ 6001.728232] p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation available
 May 31 21:08:25 silagu kernel: [ 6066.209450] ondemand governor failed, too long transition latency of HW, fallback to performance governor
 May 31 21:09:55 silagu kernel: [ 6156.095417] p4-clockmod: P4/Xeon(TM) CPU On-Demand Clock Modulation available
dmi.bios.date: 03/03/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0910
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 701
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTek Computer INC.
dmi.chassis.version: x.x
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0910:bd03/03/2008:svnASUSTeKComputerINC.:pn701:pvrx.x:rvnASUSTeKComputerINC.:rn701:rvrx.xx:cvnASUSTekComputerINC.:ct10:cvrx.x:
dmi.product.name: 701
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK Computer INC.