[root@cat ~]# xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 720, maximum 4096 x 4096
LVDS1 connected 1280x720+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1280x720       60.0*+
   800x600        60.3     56.2
   640x480        59.9
VGA1 disconnected (normal left inverted right x axis y axis)
[root@cat ~]# gtf 1900 1080 60

  # 1904x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 171.72 MHz
  Modeline "1904x1080_60.00"  171.72  1904 2024 2232 2560  1080 1081 1084 1118  -HSync +Vsync

[root@cat ~]# xrandr --newmode "1904x1080_60.00"  171.72  1904 2024 2232 2560  1080 1081 1084 1118  -HSync +Vsync
[root@cat ~]# xrandr --addmode LVDS1 1904x1080_60.00
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  148 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  25
  Current serial number in output stream:  26