$ xrandr --verbose
Screen 0: minimum 320 x 200, current 5120 x 1600, maximum 16384 x 16384
DFP1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x75
	Timestamp:  24992
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1 2 3 4 5
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	SignalFormat: DisplayPort 
	ConnectorType: DisplayPort 
.....
.....
  2560x1440 (0x7d)  241.5MHz +HSync +VSync *current +preferred
        h: width  2560 start 2608 end 2640 total 2720 skew    0 clock   88.8KHz
        v: height 1440 start 1442 end 1447 total 1481           clock   60.0Hz
  1800x1440 (0x7e)  241.5MHz +HSync +VSync
        h: width  1800 start 2608 end 2640 total 2720 skew    0 clock   88.8KHz
        v: height 1440 start 1442 end 1447 total 1481           clock   60.0Hz
  1856x1392 (0x7f)  241.5MHz +HSync +VSync
        h: width  1856 start 2608 end 2640 total 2720 skew    0 clock   88.8KHz
        v: height 1392 start 1442 end 1447 total 1481           clock   60.0Hz
  1792x1344 (0x80)  241.5MHz +HSync +VSync
        h: width  1792 start 2608 end 2640 total 2720 skew    0 clock   88.8KHz
        v: height 1344 start 1442 end 1447 total 1481           clock   60.0Hz
.....
  640x480 (0x97)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   59.9Hz
.....