An issue I faced with the Thunderbolt Display hooked up to my Macbook Pro when running bootcamp on Windows 8/8.1 was that I had no control of the Brightness of the Thunderbolt Display. It will set to the default of full brightness which is extremely bright and literally unusable. It seems that many users faced this issue on Apple forums but Apple have yet to give a proper solution to the problem. I strongly feel that this issue could be done with a software update to the bootcamp drivers. Currently, the brightness control can only control the brightness of my Macbook Pro display and does not do anything to the Thunderbolt Display. Hope that Apple come out with a software update to tackle the problem as soon as possible.
Update: Actually I was pretty much in the dark about this function that is available in the BootCamp Control Panel that actually solved my problem. I think that Apple had already implemented this function to control the Thunderbolt Display brightness, but they did not specify publicly in the Q&A forums. To control the brightness, go to the task bar of your Windows and on the far-right, you should see a black colour diamond icon that represents the Boot Camp Utility. You need to have the BootCamp drivers for this to work. Right-click on the icon and select BootCamp Control panel. You should see the Brightness tab prompting you to adjust your brightness. Adjust the slider and you will see your Thunderbolt Display changing its brightness.
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