Problem with Bootcamp..

[BatmanWest]

I installed Windows 8.1 through Bootcamp on my 2015 MBP 15' with 370x. All went well except t I can't change the resolution in Windows.

I'm stuck at 2880x1800..the option is greyed out. This also extends into some games i've installed..what can I do to fix this?

 

[Zakzilla]

I installed Windows 8.1 through Bootcamp on my 2015 MBP 15' with 370x. All went well except t I can't change the resolution in Windows.

I'm stuck at 2880x1800..the option is greyed out. This also extends into some games i've installed..what can I do to fix this?

In my experience, that's usually a driver issue. Have you checked your AMD driver / attempted to update it? Here's their website