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So I just installed Ubuntu 16.04 on my Dell XPS 13. When I get to the login screen it starts at 3200x1800 for a quick second, then I get a way lower resolution like 800x600 but as soon as I login it adjusts to 3200x1800. How would I get 3200x1800 permanently on my login screen? I didn't have this issue on 14.04.

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force your desired resolution in grub

sudo nano /etc/default/grub

Find this line

#GRUB_GFXMODE=640x480

change it to

GRUB_GFXMODE=3200x1800

then rebuild the frames and update grub

echo FRAMEBUFFER=y | sudo tee /etc/initramfs-tools/conf.d/splash
sudo update-initramfs -u
sudo update-grub

tell us if this worked.

**EDIT:

if the problem is about the login screen resolution only, read here

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Hiting ESC in GRUB and entering videoinfo showed that GRUB doesn't support all the screen resolutions available in gnome-control-center display so I used a workaround from this answer:

sudo cp .config/monitors.xml /var/lib/gdm3/.config/

Reboot to see the effect

This workaround was tested in Ubuntu 18.04 if you use version 17.04 or lower (LightDM) either upgrade to version 17.10 or above or install gdm3 sudo apt install gdm3 select your preferred resolution in gnome-control-center display then sudo dpkg-reconfigure gdm3

Select gdm3 if prompeted copy monitors.xml as shown above then reboot

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