How to fix a Mac's stuck monitor resolution

Easily resolve your resolution issue

Resolution

Sometimes a monitor might refuse to run at the desired resolution when used with a Mac. For this example, let's say you've been using an older Dell monitor (the tip below applies to other bands too) and went out to buy a new MacBook Pro. You get back, hook up the Dell, and it's stuck at a measly 1,280 x 768 pixel-resolution.

The monitor hardware is probably fine. It's more likely to be a problem with the EDID (Extended Display Identification Data) configuration — EDID is a way for monitors to tell your graphics card the best way to format images for that particular screen.

Read more: Anmeldelse: Dell XPS 15 (2018)

Stuck

Some monitors don't list their native resolution properly, and if your graphics card driver doesn't override this value, you can be stuck at 1280 x 768 or 1360 x 765. Open System Preferences > Display and hold Option while you click the "Scaled" button. This shows all the display resolutions that your graphics card can output, and you can manually force 2560 x 1440.

If the monitor still won't cooperate, you'll need to use an EDID override file. These are just text files, but creating one for yourself from scratch is a tall order. Fortunately there are override files for Dell monitors located here - you'll have to scour the internet for files if you're using another brand.