macOS

• HDR is no longer supported for certain combinations of HiDPI and refresh rate. For example, HDR is not available for 2K HiDPI with 120Hz on a 4K monitor.
  • Reducing the refresh rate or resolution may work. e.g. reducing refresh rate to 100Hz, or the resolution to 2432 * 1368.
  • Certain HDMI 2.1 adapters that support 4K@>=120Hz can solve this problem with more bandwidth.
  • See macOS 14.1 - No more HDR on 4K monitors and DP/USB-C/Thunderbolt to HDMI 2.1 4k@120hz RGB4:4:4 10b HDR with Apple Silicon M1-M4 now possible !
• Download xquartz for X11Forwarding with SSH. Need to also enable “Allow connections from network clients” in XQuartz.
• macOS has a notoriously low max file descriptors value. Raise this limit with sudo launchctl limit maxfiles <soft-limit> <hard-limit>

Resrouces

• Macked
• MacTorrents