You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

User profile for user: kerim195
kerim195 Author
User level: Level 1
4 points

Can't fix underscan on external display - help

Hello there,

I just got a Dell P2422H display, and when I first plugged it into my m1 MacBook Air , it all worked seamless, but after my Mac went to sleep and I woke it up later, my external display started showing quite some underscan. It makes it horrible to look at.


I tried a lot of ways of fixing it like:

  • Changing the resolution and refresh rate
  • mirroring the display
  • Safe mode
  • Tried using it via a test user account
  • plugging in and out the monitor, using different ports
  • plugging Mac into another monitor that shows no underscan


Things to note: There weirdly is no underscan when I change to the following resolutions (1280x1024, 1152x864 and 1024x768)

The display is connected with an HDMI cable through a satechi usb c hub.

At this point, I'm just panicking and have no idea what to do.


Help much needed!


Posted on Jan 25, 2022 2:23 PM

Reply
Question marked as Top-ranking reply
User profile for user: lllaass
lllaass
User level: Level 10
210,459 points

Posted on Jan 26, 2022 12:37 AM

From the monitor's control panel is there a way to totally reset the monitor?

Reset SMC and NVRAM (if applicable).

How to reset the SMC of your Mac - Apple Support

Reset NVRAM or PRAM on your Mac - Apple Support

View in context

Similar questions

4 replies
User profile for user: kerim195
kerim195 Author
User level: Level 1
4 points

Jan 26, 2022 1:41 AM in response to lllaass

Unfortunately, I tried factory resetting the monitor, and it just didn't work. I also tried resetting the SMC and NVRAM, neither did that work.

I noted one thing with the monitor settings: I experimented with connecting a Windows machine, and found out there's an Auto Adjust option, but only when I connect it via VGA. It also says that in the monitor's user manual.

Reply

Can't fix underscan on external display - help

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.
Learn more Sign up