Windows 8.1 Brightness problems. Screen to dim.

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.

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.

Looks like 8.1 has a setting for "Adaptive Brightness".. you can turn it off in the Advanced Section of Power Management.

~Michael.

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.

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:

http://forums.macrumors.com/showthread.php?t=1567916

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~

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!

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 *****.

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 😟

This helped me go to nvidia setting pannel , then go to Adjust desktop color setting.

Select use nvidia setting and dim the brightness. This worked for me on iMac (Late 2009). You can also bring the contrast to 0% to further dim the display

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 ...

Confirmed.

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.

Thanks Toweri Your solution worked well.

I opened monitor property and disabled "Generic Pnp Monitor" than I restarted and everything working.

Hi All,

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.

Boot Camp Support Software 5.1.5621 support Win 8.1

Apple has released new Boot Camp driver that officially supports Windows 8.1.
See http://support.apple.com/kb/DL1720 for details and download.

Enjoy! 😎