This is a very strange issue. After upgrading the kernel, my external monitors stopped showing any video.
I am using HP Probook 455 G7 along with Dell WD15 docking station and two monitors. (VGA, HDMI). When running the older kernel, I’m getting video output as expected, but as soon as I switch to the newer version, I’m no longer getting video output. The strange thing is, that somehow the monitors have to be functioning, because they appear in the Display configuration menu and I can even drag mouse and programs to them. It is just that physically they show nothing at all, both of them are in standby mode, so they don’t seem to receive any signal at all.
I can provide any extra information possible to resolve this issue.