Login screen resolution

Solution 1:

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