I have a Dell Inspiron 15 5000 series laptop. It has an Intel i7 with integrated graphics. The graphics card, works perfectly on Windows, tested for weeks before the switch.
With Ubuntu 18.04, though it caps the resolution to a weird 2048x1080 resolution with a 9:5 aspect ratio.
I have done the following, to solve this per this forum and other but with not lack. The experience is terrible. Both monitors have no borders to snap windows on them. I cannot navigate with the mouse, between monitors, and many more frustrating things.
What I did:
cvt 2560 1440,
xrandr --newmode "2560x1440)60.00" "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync,
xrandr --addmode HDMI-1 2560x1440_60.00
Then I go to settings and apply that resolution to my Dell U2518D. Yet nothing works.
I also have read somewhere, that Intel discontinued drivers for their I.Graphics, not sure if it is correct or if this is the cause.
I also have the latest intel drivers.
xserver-xorg-video-intel is already the newest version (2:2.99.917+git20171229-1)