macOS Sierra External Display Scaling Problems
After updating from ElCapitan to Sierra, crucial display scaling options (in System Preferences/Displays) were lost. Sierra allows me to run the display at its native resolution (3840x2160 px), however, the highest HiDPI (high-resolution) scaling option available is 1920x1080 (1080p), which leaves contents far too large. High-resolution scaling to 2560x1440 is no longer available; only the (blurry) low-resolution option can be selected.
Scaling to 2560x1440 HiDPI (or 3008x1692 HiDPI) was available under ElCapitan. Identical workstations not updated to Sierra (running ElCapitan) still offer the desired scaling options, suggesting that this is an OS problem rather than a hardware issue.
I already filed a bug report under ID 31012468.
Is there any known solution to the problem? Will this be addressed in the next release of macOS Sierra (10.12.4)?
FYI: I could not solve this issue with SwitchResX.
Hardware:
- Retina-MacBook Pro (late 2013, applies to 13" and 15" models)
- Dell UP3216Q, 31.5", 3840x2160px
connected via Thunderbolt port to monitor's DP1.2, high-quality cable:
https://www.amazon.com/Accell-B143B-007J-UltraAV-DisplayPort-Locking/dp/B00A7R9I 22
Software:
macOS Sierra (10.12.3)
MacBook Pro with Retina display, macOS Sierra (10.12.3), Dell UP3216Q