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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

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User profile for user: lllaass
lllaass
User level: Level 10
210,471 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

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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.

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Can't fix underscan on external display - help

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