Using Tumbleweed with Gnome for almost a year now and happy with it.
And recently after updating to latest Tumbleweed (and Kernel 4.4) I started to
have annoying issue : on an irregular basis but it can be 3 times in a minute,
both screen turn off and on

I have intel chipset (Dell e7240) ans 2 monitors connected on DVI ports of the
docking station

When that occurs I have the following log in journalctl

Feb 16 16:35:53 linux-rumm.site /usr/lib/gdm/gdm-x-session[3597]: (II)
intel(0): resizing framebuffer to 1920x1200
Feb 16 16:35:53 linux-rumm.site /usr/lib/gdm/gdm-x-session[3597]: (II)
intel(0): resizing framebuffer to 3840x1200
Feb 16 16:35:53 linux-rumm.site /usr/lib/gdm/gdm-x-session[3597]: (II)
intel(0): switch to mode 1920x1200@60.0 on DP1-1 using pipe 0, position (1920,
0), rotation normal, reflection none
Feb 16 16:35:53 linux-rumm.site /usr/lib/gdm/gdm-x-session[3597]: (II)
intel(0): switch to mode 1920x1200@60.0 on DP1-2 using pipe 1, position (0, 0),
rotation normal, reflection none