Timo is right I think. Secondary monitors will only wake up after: 1. The native kernel DRM graphics driver is loaded. 2. Plymouth detects the new driver and switches to it.
And the native kernel DRM graphics drivers seem to be loading slightly later now that we have kicked them out of the initrd. In fact I think there might be a hard limit where they can't even start loading until the root FS is decrypted. We want to keep those drivers out of the initrd because they've become bloated, but also because they take so long (up to 10 seconds) to load that they're not helpful to Plymouth wanting to display boot graphics very early. So we rely on SimpleDRM for that instead, which apparently can only display on the original BIOS display?? You should be able to work around it by adding 'amdgpu' to '/etc/initramfs-tools/modules' and then run: sudo update-initramfs -k all -u ** Package changed: plymouth (Ubuntu) => initramfs-tools (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2069039 Title: Disk password prompt isn't shown in external monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/2069039/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
