I have had this problem ever since I got a new screen. Both screens were LCDs, the old one was an LG, and the new one is an Eizo FlexScan S1911.
What happens is, whenever I play a video with mplayer, the screen goes black for a moment, and then comes back and the video plays normally. The same happens when I stop the video.
This doesn't happen with other players. I tried to test a different video output driver, in case it was xv's fault, but -vo x11 doesn't solve it.
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