HDMI Display Test

EC-A1688JD4 supports standard HDMI2.0 output.

You can test the HDMI interface with the following commands:

   insmod /mnt/system/ko/soph_drm.ko # Install display framework driver
   systemctl stop SophonHDMI.service # Stop HDMI display interface
   systemctl restart SophonHDMI.service  # Restore HDMI display interface

You can also test using "modetest":

   modetest -M cvitek -s 42@40:1920x1080-60@RG24

Where "42@40:1920x1080-60@RG24" should be modified according to the
actual resolution of the connected monitor.