Hi @numbqq & @Frank, @tsangyoujun suggested that I bring this issue to your attention. Perhaps you don’t already have enough problems. 
Also, it looks like @Frank has been addressing these eMMC image issues. Perhaps he would like to chime in. In fact, I invite anyone/everyone from Khadas to join in. lol
My problems are to do with upgrading the eMMC to Ubuntu on my EDGE-V. I’ve tried the 2 most recent Khadas dtb’s of Ubuntu desktop and the most recent dtb of server. ~90% of the boots only produce a blank green screen. ~10% (after reset button) produce a multicolored patchwork of squares (like a linear kaleidoscope). It looks like the HDMI is out of sync.
When I use the Power key to power down, there is terminal text scattered across the screen, until the Light Display Manager is stopped. Then, the sync problem also stops and the terminal text is displayed correctly until shutdown. (This also happens during normal shutdown from the Desktop GUI on both the SD card and the eMMC Ubuntu dtb’s.)
I’ve tried replacing the Light Display Manager, boot files, and .config files with files from a working SD card (from the same build date). Afterwards, I could see through three overlayed offset images that the eMMC boot had reached the desktop logon. So, I entered the khadas password and the sync issue magically disappeared when the login form refreshed. From that point, I was able to update and upgrade, create additional users, etc. Everything looked fine, until I rebooted. Then, the green screen returned… permanently. Unfortunately, I am unable to reproduce correcting the out of sync issue by logging on while it is happening.
Update: The out of sync display problem appears as soon as the HDMI drivers load, because the KHADAS logo and terminal text are fragmented, prior to LDM being loaded.
The Desktop may appear as solid green, a kaleidoscope of squarish colors, or 3 offset overlaid images of an otherwise functional desktop.
If I wait until the power saver blanks the screen, a normal desktop is immediately restored whenever it returns from sleep mode. (rather inconvenient😴)
I also noticed that the cooling fan was repeatedly revving up during sleep mode, until I logged on. Then, it immediately slowed to its normal speed. Temp is < 60 deg.
Unfortunately, I’m a Linux novice and don’t even know what to grep. So, I apologize in advance.
Thank you for your assistance.