[smp1]

Weekly Linux 5.3-rc2 build #0730x: Generic

Will there be HDR for nuc7i5bnh (kabylake) with kernel 5.3?     

Probably not, at least initially it's only for Gen 11 which means Ice Lake/Gemini Lake (and later). There may be technical limitations (LSPCON and lack of native HDMI 2.0 support) that make it impossible to support HDR on older generations.     

* ToDo: Gen9 also can support HDR with LSPCON. * Support for the same to be enabled later.
https://patchwork.freedesktop.org/patch/304214/