MacOS 15.2 screen mirroring stuck on when smart tv is used as a monitor.

I'm also having the same problem on a M2 Max Mac Studio plugged into a 43" Dell monitor - it's not even a TV, but maybe the "bug" is any screen over a certain size? Super annoying.

For anyone still having this issue; the tool Better Display Pro allows to change the display role from TV to monitor and the annoying mirroring gets "fixed".

Source: https://www.reddit.com/r/MacOS/comments/1hc5to9/comment/m1o3y1c/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

That seems to be the new reality. You can only screen mirror to a TV. I submitted Feedback, but haven't heard anything back from Apple.

It's all rather strange as I have no other monitor, so I'm not sure what it is mirroring.

Add me to the list of users affected by this issue. What’s super frustrating is I called in about 2 1/2 months ago as I was beta testing the 15.2 release. I was told by Apple support that I shouldn’t be on the beta software, and that was the cause of my issue. I asked them to report it as a bug, and I reverted back to 15.1 from a clean install. Fast forward to today, my Mac updated to 15.2, and the issue is back. I called Apple support, and they said that they’re aware of the issue and they’re working to resolve it. It seems like this should’ve been done before they pushed this update to the public.

Hey all,

On a hunch, I decided to take a chance and update to the dev build, and the issue is going. So, a fix for everyone is coming, just not sure about the timing.

This seems to be a VERY SERIOUS BUG, especially if you have a mac mini 4. I will report this exact text to apple. Since you have no built in display to begin with on a mini, the 15.2 BUG is mirroring your only external display to itself. When you click stop mirroring ( or extending) or even worse hit the “change” button, you completely loose mouse and keyboard control. The only way I could even get to my machine was through VNC and then I could force a restart from there. This cant possibly be the way apple intended for this to work. This morning, before updating to 15.2, I was using mirroring, extending my display, using sidecar, etc flawlessly. I truly REGRET upgrading to 15.2 , its a new machine. Less than a few days old

Same issue for me. Mac Mini M4 MacOS 15.2. Before the update it was also working as intended.

I have a portable USBC monitor that I plug in directly with a USBC cable. The system shows it as a 42-inch (2560 × 1600) and ASM-160QC Display. The monitor is not any larger then 17 inches though and I do expect that it is seeing it as a TV and not my primary display.

After the update it shows that it is mirroring the display when it is the only one connecting to it. I also use my Ipad M4 as a secondary monitor and was able to extend to the display without issues before the update. Now when I try to just extend to the iPad, it will blank out the USBC monitor, will not extend the display to the iPad, but I can move the mouse and type on my iPad from my Mac setup. It will not respond and I cannot see anything on the Mac screen and it does not extend the screen to the iPad. I am basically stuck at this point. I found though that unpluging the USBC Monitor from the Mini and plugging it back in will revert it back so I can at least use the Mac. I will try the software that is mentioned in this and will see if this allows me to use it again but this does need to be fixed.

I found that this issue at least for me was linked to the firewall. Temporarily disabling the Firewall via System Settings > Network > Firewall fixed the issue for me. Previous to that I had also updated to the latest Developer build, so that may factor in too. Hope this helps.

Same problem for me. I have a Mac Studio M2 Max and an LG 55QNED866RE TV. Since the 15.2 update I have the purple Icon on the top right of the menu. It says I am Extending to the TV, which would imply the Mac Studio has a built in display! I've looked everywhere but can't find one :-)

I, too, had this same issue, and Apple Support stated to then have my OS to be reinstalled.

It took a while to try to narrow this down, but using the Better Display Pro software, I was able to find that my role for my TV was already set as a Computer monitor. And before this the System Information stated that the display is a Television.

So, using the software above, I set it to Television, nothing happened, but then changed to Computer monitor and then the Screen Mirroring finally went away.

I've rebooted to make sure it was persistent, and it's still gone, which is great.

I think the update must have seen that, yes, there is a TV plugged in, the update probably configured it as a TV, even though it was slated as a Computer monitor on 15.1, got a configuration mixup, and caused it thinking that it was in perma Screen Mirroring.

Quite annoying, but it's all good now.

Top man, that did the trick! I thought it was some installed software issue or the like - it also fixed the problem with Night Shift not working! (that hasn't worked on my M4 Mini on 15.1 or 15.2).

I assume this has always been an issue, but not so readily noticeable as it is in 15.2 (as you get the Screen Mirroring Icon on your status bar highlighted with no option to turn it off!)

Thanks again, I already had Better Display - it's a great bit of software, but I didn't realize it could fix this as well!

Great stuff,

Jon. :)

Just off the phone with apple support no help,Said they have not heard of it but they are even post on reddit,,,ugh

I should add that I have two monitors attached, a Dell 43" P4317Q as my main screen connected by Mini DP to Thunderbolt and a Dell 27" U2414H as my side screen connected with HDMI. If I turn off screen mirroring then it defaults to the 27" and doesn't display the mirroring icon in the task bar.

I have my Mini connected to a Samsung TV. Same problem. Screen Mirroring is enabled, all the time. I cannot mirror my iPhone to the Apple Vision Pro when Mac Screen Sharing is on. Vision Pro says I cannot mirror two devices, at the same time. This was not a problem with earlier Sequoia versions.