If you look, you'll see you have two different CRTCs (0 and 1) but both outputs are setup to use CRTC 0. You can try forcing them to use different CRTCs with something along the lines of:
xrandr --output DVI-0 --crtc 0
xrandr --output VGA-0 --crtc 1
(or vice-versa, if that doesn't work).
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