I am attempting to use a USB-C to DisplayPort Cabel but the monitor does not appear. The Rockpro64 specifications say that the device supports DP 1.2 alt mode. My kernel version is 5.12.11-1-MANJARO.
Output inxi -Gazy:
[rock@rock ~]$ inxi -Gazy
Graphics:
Device-1: display-subsystem driver: rockchip_drm v: N/A bus-ID: N/A
chip-ID: rockchip:display-subsystem class-ID: display-subsystem
Device-2: rk3399-dw-hdmi driver: dwhdmi_rockchip v: N/A bus-ID: N/A
chip-ID: rockchip:ff940000 class-ID: hdmi
Device-3: rk3399-mali driver: panfrost v: kernel bus-ID: N/A
chip-ID: rockchip:ff9a0000 class-ID: gpu
Display: x11 server: X.org 1.20.11 compositor: marco v: 1.24.2 driver:
loaded: modesetting alternate: fbdev resolution: <missing: xdpyinfo>
Message: Unable to show advanced data. Required tool glxinfo missing.