There’s another HCL entry for the Z170-HD3P, but with external graphics, and R3.1.
Integrated graphics work properly, suspend/resume works properly, onboard sound works properly, networking works properly.
There is a secondary ASMedia USB3 controller that has the USB-C port and red USB-3 port attached to it. The rest of the USB ports are attached to the Intel USB-3 controller.
This board still has a PS/2 port for keyboard/mouse use.
Gigabyte Technology Co., Ltd.
Intel(R) Core™ i5-6600K CPU @ 3.50GHz
Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers [8086:191f] (rev 07)
Intel Corporation HD Graphics 530 [8086:1912] (rev 06) (prog-if 00 [VGA controller])
Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
SanDisk X400 M.2 Rev: 0012
Dual USB controllers - ASMedia USB controller for USB-C and red USB3 port. Also has a PS/2 port.