Having a deep color monitor, (4K monitors going forward are going to have to support 10bit color if they advertise HDR10) I wanted to test out how deep color would work with Xserver and NVIDIA drivers on Linux…
Turns out, if you set bit depth to 10bits per channel, (30bits in xorg.conf) everything breaks.
Cinnamon is broken at 30bit color.
Steam is broken at 30bit color.
All other KDE framework applications have to do an emergency fallback rendering mode in debug output.
This has been my experience on Cinnamon, but if your experience is better, I would love to know that on other DEs. Looks like this is a major fail being unable to cope with 10bit color.
I tried 36bit (12bits per color) and it didn’t work on my particular monitor.
Issue with Steam. Still not solved in 2019.
Issue with Cinnamon also reported. Also not fixed in 2019.
Nobody has taken initiative to fix 10bits per channel color on Linux. BIG blocker to HDR and WCG on Linux. 10bit monitors will become more common as more monitors “support” HDR10.