My Lenovo T440p (with optimus - i915, nouveau) running 20.04 (Kernel 5.4.0-33) is also affected. If I connect an external monitor (Dell U2515H) to it via Displayport it freezes at boot.
As workaround I switched from GDM to LightDM. With LightDM it boots straight to the login screen. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1874194 Title: Ubuntu 20.04 HDMI connected, no boot Status in linux package in Ubuntu: Confirmed Bug description: I have installed Ubuntu 20.04 (using the image created on 20 april) on my Dell XPS15 9560. This laptop has a Intel / nVidia combo. The problem i am facing is that when i have an external monitor connected to the laptop through the HDMI connector of the laptop, Ubuntu does not boot and hangs on the splash screen. I have not found any way to get logging on any kind. Before i was running Ubuntu 18.04 and did not have any problems with the monitor and HDMI cable. After boot is finished (without monitor connected) inserting the HDMI cable works fine and i can use the monitor and laptop screen without any problem. I have installed the preferred nVida proprietary driver. Also it does not matter if booting with nVidia selected or Intel selected. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874194/+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
