I created a new topic specific for the c2 + manjaro arm 19.04 and reported an issue.
Manjaro arm 19.04 kde edition installed on odroid c2 (emmc module), compared to the 19.02 the graphic performance are really better, in term of fluidity and speed, less ram is used, nice job, congratulation!
the issue :
I can't start or reboot the c2 without display connected on it, I use the c2 with a vnc server installed as service, the c2 start and reboot without problem with a display and vnc server. (problem similar with the 19.02)
I redid the tests :
After a boot or reboot when only vnc is connected I connect a display 10 or 20 seconds later, the display connected on the c2 show a blinking underscore on the top left, and nothing happens, the os don't start, strange...
When a display and vnc are connected, the the display connected on the c2 show a blinking underscore on the top left a few seconds and the os start