@Dmitry, I don't know why compositing-manager was changed from false to true, 
so I didn't know if it was important to revert it or not. I thought that people 
that want a compositing manager use compiz, but since metacity is implementing 
it with xrender instead of opengl, maybe it will work fine with older clients 
as well.
In the past I tested with xcompmgr and it did have some issues so we avoided 
using it as the default; using more RAM which was important with low-RAM 
clients, breaking vsync with full screen apps etc. Now that I know that 
metacity will be using compositing in 16.04, I'll test with and without it and 
if I find any notable issues with it I'll mention it in some other bug report.

@Alberts,
> Did not you say that this is also problem in compiz?
I did mention that I saw a white background for 0.1 seconds, sorry for that. 
Maybe it was caused by some bug in the blending effect between the lightdm/user 
background, dunno... The gnome-panel wrapper trick was a nice breakpoint that 
cleared things up.

About the patch, I tested it and it works fine here:
apt source metacity
apt build-dep metacity
patch compositor-xrender.c < 
0001-compositor-try-to-user-root-window-background.patch
debuild -b -tc
dpkg -i libmetacity*.deb metacity*.deb metacity-common*.deb
-> create gnome-panel wrapper
service lightdm restart


Thank you very much guys, you're great! :)

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https://bugs.launchpad.net/bugs/1563735

Title:
  Recent gnome-flashback clears the background on login

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