Description:
I am running Minecraft 1.12.2 on Linux (Fedora 27, kernel 4.14.8) and the game will not start with a custom resolution. I'm using a Dell XPS 13 (HiDPi) so I wanted to render the game at 1600x900 as opposed to 3200x1800. This is the log of setting the custom resolution:

https://gist.github.com/dblitt99/3e69c72a6e00004b4ba2bbf1348f8228

I then set the resolution in GNOME settings and launched the game. It crashes with this error:

https://gist.github.com/dblitt99/953de58109472f2881ce801426a05978

I have tried using the mainstream java .jar launcher aswell as the 2.0.1005-dev-linux launcher found here:

https://www.reddit.com/r/Minecraft/comments/5opl31/help_us_test_the_new_minecraft_launcher_now_with/

and here:

https://launcher.mojang.com/mc-staging/download/Minecraft_staging.tar.gz

Expected behavior:
Game launches without crashing

Actual behavior:
Game crashes upon startup

Steps to Reproduce:
I think the description above describes this.