Can't adjust thunderbolt display on Retina MBP

Hi,
I have a Retina MBP with two thunderbolt displays, the second daisy-chained to the first. My problem is that I cannot adjust the brightness on one of the displays (the first in the chain). I've tried using the keyboard's f1/f2 keys, I've tried fn-ctrl-f1/f2, etc. I've also tried going through the display preferences, where if I adjust the brightness slider bar, it adjusts only the second display.
I've rearranged the two displays so that the display with the adjustable brightness is first in the chain, and the problem migrates with the problematic display. I've also tried isolating the problematic display by removing the second monitor. In that case, none of the keys (f1/f2, fn-ctrl-f1/f2) have any effect. Even the display preferences is missing the brightness slider bar. I've tried powering everything off (unplugging), removing all of the USB devices attached to either display, but nothing seems to change this behavior.
Both displays have firmware version 22.2. Does anyone have any suggestions for debugging this further?

I sorted out how to adjust brightness from your MBP Retina to your TB display. Hold the keys Shift+ALT+ F2 or F1 depending on whether you want the display brighter/darker. This will ONLY adjust your laptop monitor which was frustrating so I figured out the following.
In order for the above key command to work ( Shift+ALT+ F2) on the external monitors, you need to plug in the USB chord hardwired to the TB display into the USB hub of your keyboard or USB hub of your laptop. This allows you to control the brightness through the USB. In addition you need to plug in the keyboard's USB to the laptop. So one USB into laptop from the TB display and one USB from keyboard into computer. Please let me know if this worked for you if you haven't already sorted the problem. Worked for me!
Thanks!
Daniel.

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Can't adjust thunderbolt display on Retina MBP

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