Currently Being ModeratedOct 21, 2013 6:13 PM (in response to Aaron21)
Based on your description, I would suggest the "power saver" options on your Windows setup. It almost sounds like Windows is dimming the screen because it doesn't think it's in use.
Currently Being ModeratedOct 22, 2013 11:54 AM (in response to Aaron21)
While it is not as easy as being able to control with the key board, starting with left-click to destop, selecting Screen Resolution,
then right click Advanced Settings,
then click Colour Management and again in resulting menu,
select Calibrate Display under the Advanced tab,
when you get to the Adjust Gamma slider, you can make your display brighter or darker.
Double click pic inserted to see it larger.
Currently Being ModeratedNov 4, 2013 9:22 AM (in response to Aaron21)
Looks like 8.1 has a setting for "Adaptive Brightness".. you can turn it off in the Advanced Section of Power Management.
Currently Being ModeratedNov 4, 2013 9:53 AM (in response to ReMacs)
This isn't really a good idea - gamma isn't the same thing as brightness and it's going to affect how things actually look on the screen.
Currently Being ModeratedNov 8, 2013 9:09 PM (in response to Aaron21)
Aaron and anyone else experiencing a similar issue...
I loaded the Bootcamp v5.0.5033 drivers on my 2009 MBP 17" (MacBook 5,2) running Windows 8.1 with success; additionally, laptopvideo2go.com has an modded INF capible of installing the latest NVIDIA drivers for even older models (requires Advanced boot-F7 to temporarily disable signed driver enforcement). However neither of these should be necessary for your issue.
For anyone like me experiencing an issue with the brightness function controls not working, see the following thread:
This thread has 2 simultaneous but different topics happening, one for Adaptive brightness settings in the Windows power controls, and the manual brightness adjustment with a MacBook (and possibly others) laptop function keys; my reply is in regards to the latter. It appears the brightness controls are now controlled by Windows rather than the Bootcamp Keyboard OSD manager. Strange as the backlit keyboard and volume function keys show the on-screen display and work fine, but the brightness is the default windows OSD slider and does not change.
As amk29j and bb426 confirm, the issue is resolved by disabling the 'Generic PNP Monitor'; upon rebooting, the "Brightness" FN-Control is now functioning back on the OSD and the Bootcamp Control Panel has a tab for it.
Cheers~OS X Mavericks (10.9), MB Pro 17" (5,2), OSX / Win8.1
Currently Being ModeratedNov 10, 2013 12:23 PM (in response to Aaron21)
I actually had the same problem and fixed by checking settings! I actually tried the method that "Admiral Kirk" pointed out and that did exactly nothing! In windows 8.1 the settings app changed alot so it took me a while. Under PC Settings->PC and Devices->Power and Sleep turn off the switch "Adjust my screen brightness automatically"! That fixed it!
Currently Being ModeratedNov 13, 2013 3:49 AM (in response to nicholas marc)
None of the above works for me (rMBP late 2013) on Win 8.1
- Monitor disable/enable
- Adaptive brightness off
- Adjust screen brightness automatically
All to no avail. Brightness is always set at the level I had it on MacOS, so at least it's not entirely dimmed, but to switch into MacOS to change your brightness *****.
Currently Being ModeratedNov 17, 2013 6:31 AM (in response to Naujoks)
I have the same problem, Macbook Pro 17" (late 2011) running windows 8.1.
Disable Adaptive brightness doesn't change anything, can't change the brightness sliders.
I have to reinstall my bootcamp display driver every time I have attached an external screen to fix it
Currently Being ModeratedNov 22, 2013 3:01 AM (in response to Aaron21)
Currently Being ModeratedNov 24, 2013 6:13 PM (in response to Aaron21)
Hi .. Not sure if this helps AT ALL or is any good but I did the normal disabling of Adaptive Brightness first but then in your Device Manager / Monitor / the screen should the 'Generic Non-Pnp Monitor'. Disbale that monitor and then restart. Worked for me. I control brightness from my keyboard shortcuts or the Boot Camp Control Panel Slider ...
Currently Being ModeratedNov 24, 2013 7:02 PM (in response to Aaron21)
I tried several of the suggestions here, but ultimately I solved the problem by reinstalling it all again(the whole partition), and then again and then it just all worked.
I have no idea why.
Currently Being ModeratedDec 17, 2013 12:41 PM (in response to maSebYw)
Disabling the "Generic Pnp Monitor" (mine was not 'non-generic') and rebooting solved the problem.
Keyboard controls now work great!
Win 8.1 fresh install, MacBook Pro 17" (late 2011), Radeon HD 6700M.
Currently Being ModeratedDec 19, 2013 4:47 AM (in response to Toweri)
Thanks Toweri Your solution worked well.
I opened monitor property and disabled "Generic Pnp Monitor" than I restarted and everything working.
Currently Being ModeratedFeb 26, 2014 6:24 AM (in response to Aaron21)
I see everybody is talking about the Pnp Monitor driver to fix this brightness problem... It didnt work for me... I uninstalled the Light Sensor from device manager and it worked Absol. Fine... Try it... Dont need to reinstall everything.
Light Sensor works fine in MAC but unfortunately no properties for this in Bootcamp Control Panel.