The current Input timing is not supported by the monitor display.
Please change your input timing to 2560×1440,60Hz or any
other monitor listed timing as per monitory specifications.
U2518D

What I did was the following:

c@b:~$ xrandr
DisplayPort-1-2 connected 1440x2560+0+0 left (normal left inverted right x axis y axis) 553mm x 311mm
   2560x1440     59.95*+
   2048x1080     60.00    24.00  
   1920x1080     60.00    50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1600x1200     60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x576i      50.00  
   720x480       60.00    59.94  
   720x480i      60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  

c@b:~$ cvt 1440 2560
# 1440x2560 59.98 Hz (CVT) hsync: 159.00 kHz; pclk: 318.00 MHz
Modeline "1440x2560_60.00"  318.00  1440 1568 1720 2000  2560 2563 2573 2651 -hsync +vsync

c@b:~$ xrandr --newmode "1440x2560_60.00"  318.00  1440 1568 1720 2000  2560 2563 2573 2651 -hsync +vsync
c@b:~$ xrandr --addmode DisplayPort-1-2 "1440x2560_60.00"

Hi, I found a bug related to this, when you name it “1680x1000_60.00” that “_60.00” extra part can cause a bug for Minecraft 12.2 (and probably older versions as well) that use java8 and the LWJGL 2.

I fixed it leaving that to “1680×1000“.

In my case was “1280x1024_60.00” and caused an error when loading the game:

“OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.”

That caused the LWJGL 2.9.4, 2.9.3, and 2.9.2 to have an issue detecting the mode in that way. The LWJGL 2.9.1 worked fine cause it uses an older/different method.

Now I found your’s said method then i try it too but when I give a command in terminal xrandr:

I get this message

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480
default connected primary 640×480+0+0 0mm x 0mm
640×480 73.00*
uhammad@uhammad-X58-USB3:~$ cvt 1680 1000
# 1680×1000 59.89 Hz (CVT) hsync: 62.17 kHz; pclk: 139.25 MHz
Modeline “1680x1000_60.00” 139.25 1680 1784 1960 2240 1000 1003 1013 1038 -hsync +vsync
uhammad@uhammad-X58-USB3:~$ xrandr –newmode “1680x1000_60.00”
139.25 1680 1784 1960 2240 1000 1003 1013 1038 -hsync +vsync
xrandr: Failed to get size of gamma for output default
uhammad@uhammad-X58-USB3:~$ xrandr –addmode DP-1 “1680x1000_60.00”
xrandr: Failed to get size of gamma for output default
xrandr: cannot find output “DP-1”
uhammad@uhammad-X58-USB3:~$ sudo vim /etc/profile.d/external_monitor_resol.sh
[sudo] password for uhammad:
sudo: vim: command not found
uhammad@uhammad-X58-USB3:~$

Please if have time reply to me.

@Philip,

Run the following command to get the list of available resolutions.

$ xrandr --verbose

The set the corresponding pixel values to set the resolution to 1920×1080 as shown.

$ xrandr -s 6