Two different modes can not both be the default mode, but the output of xrandr indicates that this is so. (Two modes are marked with a "+".) I am using xrandr 1.3.2 and the open source ati driver on an X550 video card. xrandr Screen 0: minimum 320 x 200, current 1600 x 1200, maximum 4096 x 4096 VGA-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 352mm x 264mm 1400x1050 86.0 + 85.0 74.9 74.8 60.0 60.0 1280x1024 85.0 + 85.0 75.0 60.0 1920x1440 60.0 1856x1392 60.0 60.0 1792x1344 60.0 60.0 1920x1200 74.9 59.9 1600x1200 75.0 77.5* 70.0 65.0 60.0 1680x1050 84.9 74.9 60.0 1440x900 84.8 75.0 59.9 1280x960 90.2 85.0 60.0 1360x768 60.0 1280x800 84.9 74.9 59.8 1152x864 75.0 1280x768 84.8 74.9 59.9 1024x768 88.0 85.0 75.1 75.0 70.1 60.0 832x624 74.6 800x600 89.1 85.1 85.1 72.2 75.0 60.3 56.2 768x576 100.0 79.4 848x480 60.0 640x480 85.0 75.0 72.8 72.8 72.8 75.0 66.7 60.0 59.9 59.9 720x400 85.0 87.8 85.0 70.1 640x400 85.1 640x350 85.1 480x360 90.1 320x240 120.0 240x180 155.0 DVI-0 disconnected (normal left inverted right x axis y axis) S-video disconnected (normal left inverted right x axis y axis)
'+' means "preferred" mode, not default mode. In this case, xrandr just puts a + next to any mode in the preferred mode list. The RandR 1.2 protocol explicitly lets the server return multiple preferred modes. If there's an xrandr bug here, it's that the man page says modes are listed, "with a '+' after the preferred mode" rather than "with a '+' after the preferred modes."
Should be fixed in xrandr 1.4.0. http://cgit.freedesktop.org/xorg/app/xrandr/commit/?id=d752d524027fbc20d9fdee06fed173e454f15370
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