Still present in 19.04, although as a workaround, the nvidia drivers have reverted to installing without modeset=1, so external monitors work, and Optimus users get dreadful tearing on their laptop's internal screen.
With modeset=1 (which in my case was a setting preserved during the update to 19.04): At the login prompt (using gdm3) external monitors are powered on and display a background graphic. During session start, they are lost. External monitors work with lightdm or sddm3, both supported display managers in Ubuntu, so this remains the workaround. So odd that Fedora doesn't care about this. It's a dreadful welcome to Linux moment. Using gdm3 as the default display manager seems insane given this bug. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1716857 Title: gdm3, hybrid nvidia with modeset=1, no external monitors detected Status in gdm3 package in Ubuntu: Confirmed Status in mutter package in Ubuntu: Confirmed Status in gdm3 package in Debian: New 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/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
