If you close the lid on your laptop but leave it on, it might well act the same as turning off a desktop monitor, depends on your laptop. I can however confirm that if I leave my monitor on and either set a blank screen saver or set the monitor to sleep to avoid screen burn, everything functions as normal - I can scroll, I see OpenGL etc. When I turn the monitor off, Windows acts as if there is no monitor plugged in at all (all to do with Window's Display Detection "feature") when this happens the graphics card doesn't bother rendering anything to screen, so I get some basic Windows driver instead, and that causes windows not to scroll, no OpenGL and other display issues. You can do a really quick check to see whether your PC is using your graphics card when remotely connected via Team Viewer: Connect to your remote PC via Team Viewer Right click on the Desktop and choose your graphics card Control Panel (mine being NVIDIA Control Panel) If you can see ALL of the controls for the display (for me they are 3D Settings, Display, Stereoscopic 3D and Video) then the graphics card is being used, if you see no categories or basic ones but is missing many entries, then it's using the Windows driver, and that means the issues mentioned This doesn't happen over DVI as far as I know, only HDMI and certainly Display Port connected monitors. Give it a try.
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