Description of problem:
With the video card
0a:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 550 640SP / RX 560/560X] (rev ff)
connected to a monitor with display port, no signal is produced when using 4.19.9-300.fc29.x86_64. The machine is OK and I can ssh to it.
Everything works with 4.19.8-300.fc29.x86_64.
*** This bug has been marked as a duplicate of bug 1659810 ***