# macOS <!-- cSpell:words xquartz --> - 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](https://forums.macrumors.com/threads/macos-14-1-no-more-hdr-on-4k-monitors.2408831/) and [DP/USB-C/Thunderbolt to HDMI 2.1 4k@120hz RGB4:4:4 10b HDR with Apple Silicon M1-M4 now possible !](https://forums.macrumors.com/threads/dp-usb-c-thunderbolt-to-hdmi-2-1-4k-120hz-rgb4-4-4-10b-hdr-with-apple-silicon-m1-m4-now-possible.2381664/) - Download `xquartz` for `X11Forwarding` with [[ssh|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](https://macked.app) - [MacTorrents](https://torrentmac.net/)