nVidia 3D Stereo under Linux Ubuntu 16

Gaming and Visualization Technologies General Topics and Other SDKs
1

I was using Ubuntu 12.04 LTS and everything was working fine (after I spent A LOT of time and figured out how to configure it).

Yesterday, I upgraded to Ubuntu 14.04 followed by 16.04

I transferred the xorg.conf settings from my 12.04 configuration that worked to enable Stereo 3D. That is:

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
	Option "AllowDFPStereo" "yes"
	Option "InbandStereoSignaling" "true"
	Option "Stereo" "11"
	Option "nvidiaXineramaInfoOrder" "DFP-0"
	Option "metamodes" "DVI-I-1: 1920x1080_120 +0+360, DP-2: 2560x1440_60 +1920+0"
	Option "SLI" "Off"
	Option "MultiGPU" "Off"
	Option "BaseMosaic" "off"
SubSection "Display"
	Depth 24
EndSubSection
EndSection

Section "Extensions"
	Option "Composite" "off"
EndSection

Now, if I do that, I cannot log into 16.04!
At least, using the default Unity or any of the other available Gnome shells, except for Metacity
I do not want Gnome Metacity, I want the default Unity. How can I make it work under the default Ubuntu environment, which is Unity?
That is the question.

My current xorg.conf has

Section "Screen"

Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
	Option "AllowDFPStereo" "yes"
	Option "InbandStereoSignaling" "true"
	Option "Stereo" "11"
	Option "nvidiaXineramaInfoOrder" "DFP-0"
	Option "metamodes" "DVI-I-1: 1920x1080_120 +0+360, DP-3: nvidia-auto-select +1920+0"
	Option "SLI" "Off"
	Option "MultiGPU" "Off"
	Option "BaseMosaic" "off"
SubSection "Display"
	Depth 24
EndSubSection
EndSection

Section "Extensions" 
	Option "Composite" "Disable" 
EndSection

the only line different than my 12.04 configuration is the

Option "Composite" "off"

line is now

Option "Composite" "Disable"

and Stereo 3D does work if I use Gnome Metacity to log in, but None of the others. All of the other available options GNOME, GNOME Classic, GNOME Flashback (Compiz), Ubuntu (Default)
accept the password, go blank for a short while, as if it was going to log in, but throws me back to the login screen.

If I remove the

Section "Extensions" 
  Option "Composite" "Disable" 
EndSection

section in the xorg.conf, I can log in, but the Stereo-3D does not work.

I have a Quadro K4000, with the driver 375.39 (recommended driver)
OS: Linux 4.4.0-72-generic #93-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux
Glasses: 3D Vision Pro

Thanks in advance.

2

So, no replies. Hmmm…

Could anyone manage to use quad-buffered stereo under Ubuntu 16.04?

Thanks.