Posted by Xerxes Rånby on Jun 27, 2015; 9:18pm
URL: https://forum.jogamp.org/JOGL-on-ODROID-XU3-Lite-tp4034217p4034769.html

the reason why this fix work is that the ODROID system ships with two opengl drivers

the freesoftware mesa3d drivers installed in /media/familjen/trusty/usr/lib/arm-linux-gnueabihf/mesa /media/familjen/trusty/usr/lib/arm-linux-gnueabihf/mesa-egl
 
and the properitary ARM mali drivers in /media/familjen/trusty/usr/lib/arm-linux-gnueabihf/mali-egl

the mesa3d drivers do not yet have a working free software "lima" driver that supports the latest arm mali GPU's.

by disable glx you make jogamp skip probing for libGL (mesa3d) and instead it first try to initialize using libEGL and libGLESv2 and that  picks up the properitary mali driver.