I received the HDMI 2.1 cable and the DP to TB cable. Here's what I've observed:
- DP to Thunderbolt: The system detects all available resolutions, but 3840x1620 HiDPI is not supported.
- HDMI 2.1: When connected to the LG CX Oled TV via the HDMI 2.1 port, I can get the full 120Hz refresh rate, but the desired HiDPI still isn't available.
I want to clarify a common misunderstanding: In the
Display settings, the resolution may appear as though it's at the desired resolution, but that doesn't necessarily mean it's running in HiDPI mode. While the resolution may not be shown as "low resolution," it's running at a non-scaled resolution, not HiDPI. Essentially, I haven't been able to achieve the HiDPI resolution that I could easily use with the MacBook Pro M1.
The Display Resolution screenshots shared on the forum might be misleading, as they don’t always reflect the actual behavior. I assume that the M4 Mini may not fully support HiDPI, despite what Apple’s specifications say. Please refer to the screenshot showing the Resolution Settings, System Report, and RDM.
These are my observations. I’m not planning to pursue this issue further. If I can achieve HiDPI with the MacBook Pro M1 using the same setup, I would expect the same result with the Mac Mini M4, but that’s not the case here. Thanks to everyone for your responses and assistance.