W540 with Apple 27" Thunderbolt display - how to control brightness?

Hi everyone-
I have a colleague's hand-me-down 27" Apple Thunderbolt display that I wanted to try to run on my W540, which runs Win7 x64 Enterprise.
I connect to the notebook port (do not see this port on my dock) and basic display appears.
I cannot control the brightness and the display is at a dim default level.
I tried two general online recipes to fix this situation - 1) installing Bootcamp services [1] and using the control panel and 2) installing a BrightnessController windows program [2] that is supposed to talk directly over the Thunderbolt device connection.
I could not get either one to work - Bootcamp services did not show a Brightness tab (it has that capability if the stars align) and the BrightnessController app said it could never detect the display device. I uninstalled the Bootcamp sevices to try to allow this app "exclusive" access to Thunderbolt devices, but it didn't make any difference.
The only other pieces of data I have are:
- in the Intel Graphics control panel app, it recognizes the display as a "Thunderbolt display". I can play around with some color balance settings, but these don't seem to be talking natively to the display (increasing brightness results in terrible washout of colors)
- in Windows Device Manager, my display appears as a "Generic PnP" monitor. I've never seen it described as something Apple-specific (maybe due to no specific Windows driver for it - even after Bootcamp services install)
I've read bits and pieces of Thunderbolt display issues on Lenovo forums, but nothing seemed to match my question for native hardware brightness control.
Does anyone have any useful inputs - success stories, ideas for things to try?
Thanks!
[1] http://duntuk.com/how-install-apple-thunderbolt-display-non-apple-thunderbolt-pc-brightness-control-...
[2] http://www.holstschumacher.dk/p/brightness-controller.html
Solved!
Go to Solution.

Also! Just tried installing the "Intel Thunderbolt Software" that was available from Lenovo System Update (did not see that before) - once installed, I could use the Brightness Controller app [1]
[1] http://www.holstschumacher.dk/p/brightness-controller.html

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