$ xrandr -q --verbose | grep -A 2 1680x1050
HDMI-1 connected 1680x1050+0+0 (0x3e) normal (normal left inverted right x axis y axis) 474mm x 296mm
	Identifier: 0x3c
	Timestamp:  13146156
--
  1680x1050R (0x3e)  119.0MHz +HSync -VSync *current +preferred
        h: width  1680 start 1728 end 1760 total 1840 skew    0 clock   64.7KHz
        v: height 1050 start 1053 end 1059 total 1080           clock   59.9Hz
  1680x1050 (0x3f)  146.2MHz -HSync -VSync +preferred
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
  1680x1050 (0x40)  146.2MHz -HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
--
  1680x1050b (0xa1)  146.2MHz +HSync -VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   59.9Hz
  1680x1050d (0xa2)  146.2MHz +HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   59.9Hz
HDMI-2 connected 1680x1050+1680+0 (0x3e) normal (normal left inverted right x axis y axis) 474mm x 296mm
	Identifier: 0x3d
	Timestamp:  13146156
--
  1680x1050R (0x3e)  119.0MHz +HSync -VSync *current +preferred
        h: width  1680 start 1728 end 1760 total 1840 skew    0 clock   64.7KHz
        v: height 1050 start 1053 end 1059 total 1080           clock   59.9Hz
  1680x1050 (0x3f)  146.2MHz -HSync -VSync +preferred
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
  1680x1050 (0x40)  146.2MHz -HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
--
  1680x1050b (0xa1)  146.2MHz +HSync -VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   59.9Hz
  1680x1050d (0xa2)  146.2MHz +HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   59.9Hz