Hi MajStealth,
I got a reply from Fujitsu regarding the proper way to upgrade the T902 from Windows 8 to Windows 8.1.
I haven't tried it yet as I am busy with work right now.
Here it is for your reference (you should not need to disable the power saving option):
Regarding to your inquiry, please kindly read this guide before proceeding to Win8.1 update.
http://www.fujitsu.com/hk/services/computing/pc/windowsupgradeoffer/guide/windows8.1.html
* You are strongly adviced to use “Fujitsu MyRecovery” to burn Windows 8 Recovery DVD, backup your data and disable password in advance of the upgrade.
And the following drivers/utilities should be downloaded before update:
- Bluetooth
- Button Driver
- FUJ02B1
- FUJ02E3
- GABI
- Media Slot
- IRST
- Smart Card
- Wireless Radio Switch
- Disc Burning Utility Update Pack
- OmniPass
- Power Saving Utility Update Patch
- System Manager
For details operations, you can refer to the “remarks” column.
For the button driver, pls kindly follow below steps to restore the button functionality after upgrade.
- Uninstall old button driver
Named: Windows Driver Package – Fujitsu America, Inc. (FjBtnDrv) <- version 08/01/2012
- Uninstall Fujitsu System Manager
Named: Fujist System manager <- version 8.00.0814.2012
- Install new version of button driver
Named: Windows Driver Package – Fujitsu America, Inc. (FjBtnDrv) <- version 07/10/2013
- Re-install Fujitsu System Manager
Named: Fujist System manager <- version 8.00.0814.2012
Provided that correct drivers and utilities are installed and above steps are followed, T902 should have no different functionality under Windows 8 / 8.1.
If you decide to follow this, please let us know the outcome.