Interestingly, my Motherboard's GPU0 is detected as GPU1 in nvidia- xconfig, and vice versa.
Relevant lines from Xorg log: [ 22.370] (EE) NVIDIA(GPU-0): The NVIDIA graphics device PCI:8:0:0 bound to this SLI X [ 22.370] (EE) NVIDIA(GPU-0): screen is not the SLI parent device. This configuration [ 22.370] (EE) NVIDIA(GPU-0): is not currently supported. Please add 'BusID [ 22.370] (EE) NVIDIA(GPU-0): "PCI:67:0:0"' to the SLI "Device" section in the X [ 22.370] (EE) NVIDIA(GPU-0): configuration file. [ 23.555] (EE) NVIDIA(GPU-0): Only one GPU will be used for this X screen. So I added that line to Xorg.conf, and now my screen keeps turning on and off. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1756226 Title: nvidia-driver-390 fails to start GUI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1756226/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs