Using xrandr and gtf to add a new mode to your X configuration at runtime | arunviswanathan.com

Using xrandr and gtf to add a new mode to your X configuration at runtime | arunviswanathan.com:

'via Blog this'

In case if xrand reports:


DP3 connected 1920x1080+1680+0 (normal left inverted right x axis y axis) 477mm x 268mm
   1920x1080      60.0 +
   1680x1050      60.0

but monitor can not detect signal it is worst to try subj solution.

In my case HP EliteBook -> DP -> Benq BL2400 could not accept  '1920x1080      60.0' but

was convinced via:

xrandr --output LVDS1 --off
xrandr --newmode "1920x1080_59.90"  172.51  1920 2040 2248 2576  1080 1081 1084 1118  -HSync +Vsync
xrandr --addmode DP3 1920x1080_59.90
xrandr --output DP3 --mode 1920x1080_59.90 --rotate normal --output VGA1 --auto --rotate normal --left-of DP3 --pos 0x0