Bugzilla – Bug 1180710
black screen when booting with external monitor connected
Last modified: 2021-01-11 22:25:05 UTC
When booting the system (ThinkPad X240) without an external monitor everything seems to work fine. But when I boot the system with an external monitor connected both monitors (internal and external) stay black (when X starts - kernel messages upto then are shown on both monitors). In that case I cannot even switch to the console or even toggle NumLock. The strange thing is that when I boot the system without the external monitor connected and X is up, I can connect the monitor and both monitors are working fine. Also note that about three weeks ago the problem did not show up at all. The software was updated in between.
Created attachment 844950 [details] Xorg log with external monitor
Created attachment 844951 [details] Xorg log without external monitor
You might be hit by https://bugzilla.opensuse.org/show_bug.cgi?id=1180543. Try kernel 5.10.5 from OBS Kernel:stable (https://download.opensuse.org/repositories/Kernel:/stable/standard/), which has the fix.
Thanks for the link. I have the same problem and the newer kernel works. *** This bug has been marked as a duplicate of bug 1180543 ***
JFYI: Kernel 5.10.5 is on its way to TW (https://build.opensuse.org/request/show/860967)