glx-gears -stereo is not displayed in 3D for IceWM environment

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Environment

SUSE Linux Enterprise Desktop 12 SP2
SUSE Linux Enterprise Desktop 12 SP3

Situation

glxgears -stereo is not displayed in 3D for SLES12 SP2 & SP3 IceWM environment

Resolution

open Terminal and run following commands:

$ sudo -i
# yast2 sysconfig

Select "Desktop" and hit spacebar for sub-menu, select "Display manager" and hit spacebar again,

select DISPLAYMANAGER and hit enter. Use Tab key or Alt+e key combination to change DISPLAYMANAGER setting.
Select "xdm" from the list.

Use Tab key for switching back to Configuration Options, use arrow buttons and select Window manager,

hit spacebar and select DEFAULT_WM Use Tab or Alt+e to change Setting of: DEFAULT_WM
Select "icewm" from the list. Select "Finish" with Alt+f key combination to take over the new settings.

The default display manager is now xdm instead of gdm and the default window manager is icewm

as xdm doesn't allow to change the window manager before login.

Now change settings for extensions:

# vim /etc/X11/xorg.conf.d/50-extensions.conf

You should see:

> Section "Extensions"
> Option "XFree86-DGA" "Disable"
> EndSection

Edit this to:

> Section "Extensions"
> Option "XFree86-DGA" "Disable"
> Option "Composite" "Disable"
> EndSection

Save the changes you have made:

press Esc, :wq and hit Enter

and reboot with

shutdown -r now

XDM asks for the user name first and then for the password. Enter both, IceWM should come up after login.

Cause

Stereo visual are not supported together with compositing as per NVidia driver documentation:

Workstation overlays, stereo visuals, and the unified back buffer (UBB)
are incompatible with Composite. These features will be automatically
disabled when Composite is detected.

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