Comment 10 for bug 1801359

* with nvidia proprietary driver 430 and Disco runtime/kernel-5.0.0-23-generic, one can login via the external monitor while the built-in one still remains off. Mainline kernel v5.2.8 has the same situation, but v5.3-rc4 gets worse as it can't even set the external monitor resolution right.

* the pcie dmesg errors about 0000:06:00 and 0000:07:00 are unrelated,

* mouse cursor may move across the screen border into the built-in one while it's still off under `Join Screens` configuration, so the configuration should be effective to a certain degree.