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Issue with Graphics Performance after Upgrading to Windows 8.1. Using Radeon HD6700M

I recently upgraded to Windows 8.1, and after doing so I noticed extremely poor performance when gaming, where as when on windows 8 I was facing no issues. I have downloaded and installed AMD ...
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1answer
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Graphical login does not start properly at boot time after upgrade from Squeeze to Wheezy

At boot time, KDM (or XDM or LightDM) fails with Xorg error: no screens found. But a manual restart using service kdm restart seems to fix it. Xorg errors [ 17.551] (II) Module fbdevhw: ...
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How do I know if I have KMS enabled?

How can I check if KMS is enabled in my kernel? I've compiled mine with KMS radeon modeset defaulting to 1, but I still suspect that it is not enabled. EDIT: aatiis@aiur ~ $ dmesg | grep drm [drm] ...