openSUSE 13.2/Gnome 3.14.3 logout - GDM login menu lost 'next morning'

New Supermicro 5038A-iL office workstation with GFX 960 and running the latest 13.2 x86_64 Nvidia G04 346.59-5.1.
After typical logout from Gnome 3.14.3 after work, the GDM login menu is lost next morning, just the grey screen is displayed. Usually it is possible to do Ctrl+Alt+F1 to get the consol login and reboot from there, which brings back the GDM login menu, though it has happened I had to power on also.

I think this is a fairly standard+ openSUSE 13.2 installation, without any specially setup regarding power save.

Any suggestion what causes this behaviour, possibly if it has anything to do with ‘resume’?

Below is a system printout suing inxi:

System:    Host: alfa Kernel: 3.16.7-7-desktop x86_64 (64 bit) 
           Desktop N/A Distro: /etc/SuSE-release corrupted, use -% to override
Machine:   System: Supermicro product: SYS-5038A-IL version: 0123456789
           Mobo: Supermicro model: X10SAE version: 1.01 Bios: American Megatrends version: 2.0a date: 05/09/2014
CPU:       Quad core Intel Xeon CPU E3-1241 v3 (-HT-MCP-) cache: 8192 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) 
           Clock Speeds: 1: 3643.281 MHz 2: 3511.894 MHz 3: 3607.734 MHz 4: 3500.00 MHz 5: 3579.707 MHz 6: 3573.964 MHz 7: 3519.687 MHz 8: 3557.695 MHz
Graphics:  Card: NVIDIA Device 1401 X-Vendor: N/A driver: tty size: 80x24 Advanced Data: N/A for root 
Audio:     Card-1: NVIDIA Device 0fba driver: snd_hda_intel Sound: ALSA ver: k3.16.7-7-desktop
           Card-2: Intel 8 Series/C220 Series Chipset High Definition Audio Controller driver: snd_hda_intel
Network:   Card-1: Intel I210 Gigabit Network Connection driver: igb 
           IF: eno2 state: up speed: 1000 Mbps duplex: full mac: <filter>
           Card-2: Intel Ethernet Connection I217-LM driver: e1000e 
           IF: eno1 state: down speed: N/A duplex: N/A mac: <filter>
Drives:    HDD Total Size: 300.1GB (5.4% used) 1: /dev/sda INTEL_SSDSC2BB30 300.1GB 
Partition: ID: / size: 40G used: 8.4G (22%) fs: ext4 ID: /home size: 42G used: 2.0G (5%) fs: ext4 
           ID: swap-1 size: 2.15GB used: 0.00GB (0%) fs: swap 
Sensors:   Error: You do not have the sensors app installed.
Info:      Processes: 254 Uptime: 0:56 Memory: 1351.0/32162.4MB Client: Shell inxi: 1.7.24 

Terje J. Hanssen