(Disclamer: Я тупой и у меня Мак).

Первая команда выдает ошибку:

xrandr: Failed to get size of gamma for output default
warning: output MYOUTPUT not found; ignoring
X Error of failed request:  BadRROutput (invalid Output parameter)
  Major opcode of failed request:  142 (RANDR)
  Minor opcode of failed request:  15 (RRGetOutputProperty)
  Serial number of failed request:  20
  Current serial number in output stream:  20

вторая выдает:

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1680 x 1028, maximum 1680 x 1050
default connected 1680x1028+0+0 (0x132) normal (normal) 0mm x 0mm
    Identifier: 0x120
    Timestamp:  2066616828
    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:
  1680x1050 (0x121) 105.840MHz
        h: width  1680 start    0 end    0 total 1680 skew    0 clock  63.00KHz
        v: height 1050 start    0 end    0 total 1050           clock  60.00Hz

(И далее около 20 разных разрешений экрана)