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 1366x768+0+0 (0x520) normal (normal) 0mm x 0mm Identifier: 0x51f Timestamp: 25904 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 1366x768 (0x520) 0.000MHz *current h: width 1366 start 0 end 0 total 1366 skew 0 clock 0.00KHz v: height 768 start 0 end 0 total 768 clock 0.00Hz