Brightness with bootcamp and windows 8.1 on rMBP 13 2013

Hi,
I've googled for this issue and i've found many potential solves of my problem:
- Turning off adaptive brightness
- disabling Light sensor in Device Manager
- deleting SensorsAlsDriver.dll
Nothing works. I'm actually using Win 8.1 Pro N x64 with installed Media Feature Pack and with the newset updates. It is fresh-installed via bootcamp manager.
After sleeping and waking up my Mac brightness buttons magically start working!
What do I suspect?
When i delete SensorsAlsDriver.dll and uninstall Proximity sensor in Device Manager, after reboot Windows re-installs the sensor, and re-apply the .dll file.
I dont have an idea how to prevent OS from doing it...and I think it is potential solution.
Could someone help me solving this problem?

I've been experiencing this same issue. I have the exact same laptop and running windows 8.1 pro through bootcamp. Everything runs great except the brightness doesn't seem to work properly. Also the keyboard's backlight is maxed out everytime i turn it on no matter what the lighting conditions. This isn't too big of a deal as i can turn it down once its on but still a minor inconvenience. My bigger issue is that the laptop's brightness is set to a certain level when i boot up in windows 8.1 and i can't change the level of it. I've tried disabling the adaptive brightness with no fix. I read somewhere that disabling the generic PnP monitor under device manager might fix it but im worried that it will disable my laptop's screen altogether and have to redo my bootcamp partition all over again. I have the latest bootcamp drivers for apple that were updated in early feb (2014) so I know that's not the issue and i have also tried reinstalling the bootcamp drivers but it just seems to do it again after a reboot. Dont' know any other fixes. I really want to get this working, other than that, bootcamp on windows 8.1 is perfect on my 13 retina pro.

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