USB-C to HDMI on Dell XPS 13 9360

With the Kernel 4.13 this issue is fixed for me.

Downloading and Installing for X64

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.13/linux-headers-4.13.0-041300_4.13.0-041300.201709031731_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.13/linux-headers-4.13.0-041300-generic_4.13.0-041300.201709031731_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.13/linux-image-4.13.0-041300-generic_4.13.0-041300.201709031731_amd64.deb

Installing the packages

sudo dpkg -i *.deb

Now just reboot and enjoy using your USB-C to HDMI adapter.

Reference : https://en.cristiantala.cl/fixing-ubuntu-usb-c-to-hdmi-dell-da200/

For me the workaraund is setting the audio to hdmi port, as soon as I do that colours on the external monitor become correct.