I'm on Ubuntu 19.04 as well and having issues with this. I have an i7-8750h paired with a gtx 1050ti in a Dell G515.
I don't exactly what I did, but I can give a general idea: I decided this morning that battery life was important to me, so I tinkered around with TLP. After I did that everything seemed fine, but when I plugged an HDMI cord back into my laptop, after reenabling my discrete GPU it no longer works. I have uninstalled and reinstalled TLP, I have reinstalled gdm3, no dice, and I have tried reverting just about everything I can think of that pertains to displays. I still can't get it. Switching over to lightdm for now, this is very frustrating though. Before I was working with TLP though, I was able to connect to external displays via this HDMI cord no problem. I know it is not a hardware issue because before I log in the external display shows the image I have for my lockscreen. However, it's once I log in that the display turns off. Hope this helps. I'd love to help get gdm3 working as well. LMK if you need anything including logs. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1716857 Title: gdm3, hybrid nvidia with modeset=1, no external monitors detected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1716857/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
