External display locked to 640x480 after Windows 8.1 upgrade on 2011 MBP 17 in

I just upgraded to 8.1 from Windows 8 in Bootcamp on my 2011 MBP 17in. Windows 8 ran fine and I was able to connect my Mac to an external display just fine.
After the upgrade to 8.1 when I connect my external display it will only support a resolution of 640x480  and only shows a resolution 640x480 as the is the maximum res it can go. I have also loaded the Windows display driver to the Dell E228WFP to no avail. Any external display I try only shows a resolution of 640x480.
I have removed the AMD Radeon HD7400M from device manager and re-installed the drivers from boot camp 5 but this doesn't resolve the issue.
Any others havng this issue?
Thanks.

Hi,
I ran into the same problem but I found out a solution for my early 2011 15-inch MBP.
Basically, with the 8.1 upgrade, the OS mistook my graphics card for another. More specifically, it saw my Radeon HD6490M as one from the 7400M series.
What I did to solve my problem was go to the Device manager, find my graphics card, right-click to get to the 'Properties' panel, and revert to the previous driver (the option should be available). Thanks to this, it reverted to the driver that was used when I was running Windows 8, and my external monitor is working great now.
I hope this will help you!

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