It just doesn't exist yet. There is a possibility that AMD might start supporting HDR this year. Intel is working on it. Nvidia hasn't gotten much further than https://www.x.org/wiki/Events/XDC2016/Program/xdc-2016-hdr.p... . It'll come, but we're not there yet.
Mind, even on Windows, it's pretty messy and you have to do a lot of figuring out and hacking platform layers to make it work.
Mind, even on Windows, it's pretty messy and you have to do a lot of figuring out and hacking platform layers to make it work.