Video bug when going to fullscreen

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http://ubuntuforums.org – I am playing in window mode with the default video player in Ubuntu. I press CTRL+ALT+NUM_1 on the keyboard and the video player is repositioned and resized to fit in the bottom-left quadrant. Next I double-click on the video playback. What I expect is "full-screen" video playback, but what I get is "half-screen" video playback (or barely that, looks more like 40%). (Hardware)