Hey folks- just wanted to say I had the same problem and solved it.
-No screen rotation / orientation change.
-Screen kept defaulting to 800x600 after boot.
-Video adapter driver in Device Manager shows up as "Standard VGA Adapter".
-Secondary video port is "unknown device".
-All other buttons work, (up/down, tablet options, etc.) EXCEPT orientation button.
-No option for Sleep or Hibernate in the shutdown menu, they're greyed out.
I tried Windows Update and Lenovo Update Manager to install drivers. I also downloaded the XP graphics drivers from Lenovo and installed them manually. They would refuse to load at boot.
The solution for me was to install the INF files using Intel's "INF Update Utility". The executable is called "infinst_autol.exe". Then, I downloaded the Windows XP graphics driver from Intel. Yes, I'm using Windows 7, but I installed the XP driver. There's a version "1424.xxx" that comes in a .ZIP file "intended for developers". That's what I used, NOT the "1425.50xx" "Latest" driver that comes in a .EXE.
So to summarize:
1) Go to Device Manager, uninstall the "Standard VGA Adapter" and "Non-PnP VGA Display". Don't reboot yet.
2) Go to this page:http://downloadcenter.intel.com/SearchR ... set+Family
Choose "Windows XP Professional" as your operating system, NOT Windows 7!
3) Get these files and install them:
infinst_autol.exe "INF Update Utility - Primarily for Intel® 5, 4, 3, 900 Series Chipsets"
win2k_xp1424.zip "Intel® Graphics Media Accelerator Driver for Windows* XP (zip)"
4) Reboot. If everything else is okay (Lenovo Button Manager, for example), then you should be able to enjoy screen rotation automatically and by using the display orientation button.
I hope this saves someone the hours of frustration I went through to figure it out!
oh, and P.S. the handwriting recognition in win 7 is a vast improvement over XP! It's worth the upgrade-