The fix is of course to replace all DEPRECATED(13.0 to DEPRECATED(10.8 in /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/CoreGraphics.framework/Versions/A/Headers/CGDisplayStream.h Still, it is a shame Apple shipped this in such a state.

This is not right even in the final 14.3...

Hope this will be fixed otherwise I won't be able to use 14.3...

The app BetterDisplay (https://betterdisplay.pro) can both read and override (!) the EDID on Apple Silicon, so both are definitely doable

You might want to try BetterDummy to create any HiDPI resolution you'd like, even on sub-4K external displays (which do not allow HiDPI by default on M1 macs).

Finally, the problem is now solved, DDC/CI control is now possible for M1 Macs (except through the M1 Mac Mini's HDMI port which seems to have the same problem in this regard as the 2018 Mac Mini's HDMI port). See the developments here: https://github.com/alin23/Lunar/issues/210 https://github.com/MonitorControl/MonitorControl/issues/323 :)