NTKRPAMP.EXE causing Bluescreen on T500 with switchable graphics

I am getting a BSOD on a new T500 that has the swtichable graphics. Any help would be appreciated. Here is the bugcheck information:
BugCheck 9F, {4, 258, 0, 0}
Probably caused by : ntkrpamp.exe ( nt!PopBuildDeviceNotifyListWatchdog+27 )
Followup: MachineOwner
0: kd> !analyze -v
* Bugcheck Analysis *
DRIVER_POWER_STATE_FAILURE (9f)
A driver is causing an inconsistent power state.
Arguments:
Arg1: 00000004, The power transition timed out waiting to synchronize with the Pnp
subsystem.
Arg2: 00000258, Timeout in seconds.
Arg3: 00000000
Arg4: 00000000
Message Edited by khay508 on 12-16-2008 05:21 AM

Hi tt_ttf,
I did a quick test on the T400 with switchable GPU... Upgraded video driver to 8.792.50, PM to 3.64 and PM Driver to 1.64... Rebooted the laptop several times during installation then switch to energy saver then high performance GPU several times and it worked fine ...
Can you try uninstalling the GPU driver and see if it helps?
//JameZ
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Hi @Varunhellboy
Welcome to the HP Forums!
It is a superb place to find answers and suggestions!
For you to have the best experience in the HP forum I would like to direct your attention to the HP Forums Guide Learn How to Post and More
I understand that you are having an issue with your switchable graphics.
Here is a link to HP Notebook PCs - Overview of Switchable Graphics or Dual GPUs
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Performing an HP system recovery (Windows 8)
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There will be an option during the recovery to backup your personal files to prevent data loss. If you do not already have one , now is the time.
HP PCs - Restoring Files that were Backed Up Using HP Recovery Manager (Windows 8)
You may also consider contacting HP support for assistance.
Please call our technical support at 800 474 6836. If you live outside the US/Canada Region, please click the link below to get a support number for your region.
World Wide Phone Support
Best of Luck!
Sparkles1
I work on behalf of HP
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NTKRPAMP.E​XE causing Bluescreen on T500 with switchable graphics

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