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Old 10-31-10, 12:29 AM   #4
NVIDIA Corporation
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Join Date: Mar 2005
Posts: 2,487
Default Re: glX VSYNC does not work with ACER GD245HQ

Are you running a composite manager?

Also, unless you're using a Quadro with the Unified Back Buffer enabled, the hardware can't use flipping to guarantee that SwapBuffers actually happens during vblank unless your window is full-screen. It's possible that the 120 Hz mode has too short of a vblank for the hardware to perform the swap before the screen starts scanning out the new frame.
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