xrandr: Failed to get size of gamma for output default Screen 0: minimum 1366 x 768, current 1366 x 768, maximum 1366 x 768 default connected primary 1366x768+0+0 (0x521) normal (normal) 0mm x 0mm Identifier: 0x520 Timestamp: 36117 Subpixel: unknown Clones: CRTC: 0 CRTCs: 0 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: _MUTTER_PRESENTATION_OUTPUT: 0 non-desktop: 0 supported: 0, 1 1366x768 (0x521) 79.731MHz *current h: width 1366 start 0 end 0 total 1366 skew 0 clock 58.37KHz v: height 768 start 0 end 0 total 768 clock 76.00Hz