No video signal when connecting to a USB-C monitor

What problem did you encounter

No video on USB-C

What is the actual behaviour?

No video signal on USB-C

What is the expected behaviour?

Video signal on USB-C with "gnome" desktop

How to reproduce

Connect a USB-C compatible monitor to Librem5 Chestnut USB-C port.

See no signal on monitor.

What hardware are you running on?

• amd64 qemu image
• Librem5 devkit
• Librem5 Chestnut Phone

Relevant OS information

Which kernel are you using?

Linux pietro 5.3.0-librem5-h1 #1 SMP PREEMPT Tue Dec 24 15:42:56 CET 2019 aarch64 GNU/Linux

Which OS are you using?

ID=pureos
NAME=PureOS
PRETTY_NAME=PureOS

VERSION_ID=9.0
VERSION_CODENAME=amber

HOME_URL="https://pureos.net/"
SUPPORT_URL="https://puri.sm/faq/#faq-WherecanIfindoutmoreaboutPureOS"
BUG_REPORT_URL="https://tracker.pureos.net/"

LOGO=pureos-logo-icon

Any other information that may be helpful?

• Monitor is a Samsung LS24H850QFNXZA