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I just bought an Acer K272HUL 27" monitor capable of 1440 resolution to use with a 4k laptop running Ubuntu 18.04 and a Nvidia 960M GPU. I followed the directions here(I needed to use cvt - r since this model blanks)

https://wiki.archlinux.org/index.php/Xrandr#Adding_undetected_resolutions

Everything seems to work great. I get 2650x1440 on the Acer. My problem is how to make this permanent? The instructions say to create an entry in /etc/X11/xorg.conf.d/10-monitor.conf but I don't think I have that file under Ubuntu 18.04. How do I make this resolution option permanent?

These are the files/directories under /etc/X11/ ` app-defaults rgb.txt Xreset.d Xsession.options cursors xinit Xresources xsm default-display-manager xkb Xsession XvMCConfig fonts Xreset Xsession.d Xwrapper.config

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Hmmm. I think this may have worked.

gedit ~/.profile

added to the end of the file and saved

xrandr --newmode "2560x1440R"  241.50  2560 2608 2640 2720  1440 1443 1448 1481 +hsync -vsync
xrandr --addmode HDMI-1-1 2560x1440R

Anyone see any issues this might cause?

This is where I found this solution. http://ubuntuhandbook.org/index.php/2017/04/custom-screen-resolution-ubuntu-desktop/

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