What we know about this bug is that gdm3, nvidia and modeset=1 is broken under configurations which are not broken when sddm and lightdm are used.
we know that gdm3 sessions with external monitors work with root permissions. we know that gdm3 compiled with wayland also works (according to the gentoo user generix). And neither gnome developers nor nvidia acknowledge a bug. If you make a venn diagram of all of this, gdm3 is the intersection of every observation. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to nvidia-graphics-drivers-375 in Ubuntu. https://bugs.launchpad.net/bugs/1716857 Title: nvidia-drm.modeset=1 results in no monitors detected by Xorg Status in gdm3 package in Ubuntu: Invalid Status in mutter package in Ubuntu: Invalid Status in nvidia-graphics-drivers-375 package in Ubuntu: Confirmed Status in nvidia-graphics-drivers-418 package in Ubuntu: Confirmed Bug description: Context: 17.10 development packages, nvidia binary driver 375, modeset=1 for the nvidia driver. ubuntu desktop (gnome shell), fresh install ThinkPad W520 in Nvidia Optimus bios mode. Nvidia profile. Result: no external monitors are detected. xrandr does not even list them as disconnected (normally it would list five external disconnected monitors) lsmod shows that nvidia driver is loaded and the modesetting is working at some level because there is no tearing on the laptop panel Note: modeset=1 is the only way to get flicker-free graphics on the laptop panel. modeset=1 is not the default setting but it is highly desirable. It works if lightdm is used which is why I have reported this against gdm3 My sessions in this configuration have mostly crashed after a few minutes with a gdm3 fail whale message in syslog but nothing else looks interesting. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1716857/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
