cdn-dp fec00000.dp: Direct firmware load for rockchip/dptx.bin failed with error -2
That missing file seems to be firmware for "rk3399 Type-C DisplayPort controller" (first commit in log: In Ubuntu it's in package linux-firmware:

$ dpkg -S dptx.bin
linux-firmware: /lib/firmware/rockchip/dptx.bin

I haven't tried Debian/Stretch myself but firmware-linux package sounds promising there (

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