Mac mini M4 trouble using two 4K TVs as displays
I have two 4K TVs that I use in my home office, I use these as a dual monitor setup on my work laptop throughout the day. One is a 43 inch Sony Bravia KD43X75WL and the other is an older Samsung 40 inch TV. These both work fine with my Windows laptop in 4K as extended screens, where I'm using USB-C to connect to the TVs HDMI ports.
So, I'd like to replicate this setup for my Mac Mini, it should be straightforward, but.... I purchased two of these USB-C to HDMI adaptors: https://www.amazon.co.uk/dp/B08X6QFSVZ?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1 note they support 4K @ 60hz. If I plug the Sony TV alone, then I can run it at 4K resolution. However, as soon as I connect the Samsung TV, the Sony screen freezes and the Samsung takes over as master.
If I then unplug the Sony TV and plug it back in I see the message 'Choose to mirror or extend display from the menu'. I can the 'add' the Sony TV as a mirrored display and resolution is OK (both are the same). But if I want to extend the display then the Sony TV will only go up to 1080p while the Samsung will remain at 4K.
I have tried many different combinations to resolve this behavior: HDMI direct cables/ changing the order of connecting, lowering the resolution on both screens etc, but have not found a solution. When look as videos showing how to connect more than one monitor, the Display settings item simply shows both screens, side by side without any icons to indicate that they are 'different'.
However, I have to mirror or extend to see both screens, and then the Sony is the one I have to add every time, where it has a small icon - see the attached image:
I'd love to be able to fix this properly, so any help in resolving this will be much appreciated.
Thx
Mac mini, macOS 15.3
