smcleod3d ago

New Apple Silicon M4 and M5 HiDPI Limitation on 4K External Displays

https://smcleod.net/2026/03/new-apple-silicon-m4-m5-hidpi-limitation-on-4k-external-displays/

New Apple Silicon M4 & M5 HiDPI Limitation on 4K External Displays

A regression in external display support on Apple Silicon M4/M5 generation chips prevents full HiDPI modes on 4K monitors, limiting users to either blurry non-HiDPI or reduced workspace HiDPI.

smcleod.net
Show threadnuker3d ago

Send it to Tim Cook email. It worked for me fixing DisplayPort DSC bug. After Catalina, later MacOSes lost ability to drive monitors at higher than 60Hz refresh.

Apple support tortured me with all kinds of diagnostics, with WontFix few weeks later. Wrote email and it got fixed in Sonoma :)

https://egpu.io/forums/mac-setup/4k144hz-no-longer-available...

Page 10 | 4k@144Hz no longer available after upgrade to Big ...

Page 10 | Hello, I have just updated to Big Sur and the os will no longer output 4K @ 144Hz to my monitor. First my setup: Base 2018 15" MacBook P...

eGPU.io
Show threadnerdsniper
Thank you
Mar 30 at 3:20amWeb