Comment 0 for bug 1938999

I have two external displays chained via Display port connected to the ThinkPad Thunderbolt 3 Dock.

They are working with kernel 5.8.0-63 but not with the new 5.11.0-25 kernel.

I could reproduce this behavior several times for both kernels, as follows: I booted up with disconnected dock, logged in, then I connected it, disconnected it, and connected it again.

With the 5.11.0-25 kernel the external displays go black; the main screen turns off and on several times. Sometimes the main screen remains working, but UI is lagging.

I'm attaching the logs. Two separate boots for each variant are marked 'a'/'b'.