xrandr: Failed to get size of gamma for output default Screen 0: minimum 3840 x 2160, current 3840 x 2160, maximum 3840 x 2160 default connected 3840x2160+0+0 (0x522) normal (normal) 0mm x 0mm Identifier: 0x521 Timestamp: 68075 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: non-desktop: 0 supported: 0, 1 3840x2160 (0x522) 0.000MHz *current h: width 3840 start 0 end 0 total 3840 skew 0 clock 0.00KHz v: height 2160 start 0 end 0 total 2160 clock 0.00Hz