Login screen resolution

Question

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.

Solution

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