Ubuntu worked fine before Windows update on my SSD. Kernel settings reseted for some reason.I readjusted BIOS, I enabled PCI 1 instead of motherboard setting. 1 hdmi and 1 dvi cable is connected to GTX 970. I had 390.116 nvidia driver on Ubuntu. (But maybe I had an older driver and I updated it with sudo update before I used Windows, and that new update caused problems.)
What happends during the boot:
Second screen shows up during boot, I select Ubuntu on boot menu and then some boot stuff happen and then second screen gets disabled and first screen shows up instead, and i login and continue.
From Settings->Display recognizes only the first screen. Nvidia X Server Settings -> X Server Display Configuration -> Only the first screen is detected.
What I have tried:
By using tty --> I purged nvidia-* --> rebooted --> worked like charm! the problem is with nvidia drivers (And I need them for gpu accelerated processing stuff).
From Software & Updates --> Additional Drivers --> Couple of nvidia drivers show up (390,396,410,415,418) I purged and reinstalled 4 of them and none of them worked.
Can the problem related with GNOME?
11 Answer
I had the same problem in 2019 on my HP Omen laptop. After a pushed-windows update, my bios got updated. After that my ubuntu boot-up time increased and my second monitor was no longer being detected. The solution was to disable secure boot in the bios.
