M1 Underscan Issue

The M1 stopped remembering the display underscan settings a few updates back, and this has still not been dealt with despite numerous attempts to get it done by actually calling Apple support and wasting an hour with polite staff who acknowledge the problem but don't fix it.

Mac mini

Posted on Jun 8, 2023 11:16 AM

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Intermittent problem of losing underscan setting There was a bug fixed in Monterey that has reappeared in Ventura. I reported it, but it hasn’t been fixed in either of the recent updates to Ventura. I’ll describe the bug, but my main question is how to get Apple’s attention to acknowledge or fix it. The bug (on my Mac Mini M1) is that the underscan setting on my second monitor (also a TV) is sometimes lost. As a result, the menu disappears off the top of the screen. Each time, to get it back, I have to move the cursor off the top left corner of the screen, click in no-man's land, then click on "tings" (the end of settings which is partly hidden) then reset the underscan in the settings menu. The circumstances in which the underscan setting is lost are predictable and replicable: It is lost when I switch the second monitor off and back on again (which can sometimes be useful for energy saving). It is also lost if I switch on my Mac whilst the second monitor is switched off, but then switch the second monitor on after the Mac has booted up. The setting is not lost if the second monitor is switched to an alternative input source and then back to the MAC. The setting is not lost if I switch the monitor on before switching on the MAC, and then keep the monitor switched on. The problem remains even when I’ve done safe-mode boots to correct any problems. I am still able to use the MAC to do everything, but it is an irritation having to go through this reset procedure every time the setting is lost. At the very least, I'd like to get some feedback from Apple that my bug report from last month has been received and is in the pipeline to be fixed.
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2 replies

Oct 17, 2023 01:27 AM in response to LythamStAnnesGuitarShop

The workaround I have developed is:

Open settings>displays and scroll to the underscan slider.
Now shutdown with the 'Reopen windows when logging back in' ticked.

This means that at least the underscan slider is ready to be adjusted when you start up and stays there in the background while you go about your day using other apps. I only use this machine for Logic production work.

den.thed

Level 10

88,948 points

Jun 8, 2023 01:25 PM in response to LythamStAnnesGuitarShop

What make and model is your external display?

What cable or adapter and cable are you currently using to the display?

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M1 Underscan Issue