Created attachment 1454449 [details] dmesg output from kernel-4.17.2-200.fc28.ppc64le Description of problem: With kernel-4.17.2-200.fc28.ppc64le the output of my WX5100 is blank. With kernel-4.16.16-300.fc28.ppc64le the display worked. Version-Release number of selected component (if applicable): kernel-4.17.2-200.fc28.ppc64le How reproducible: This is 100% reproducible. Steps to Reproduce: 1. Boot machine with kernel-4.17.2-200.fc28.ppc64le Actual results: A blank screen. Expected results: The default login screen. Additional info: I'm running an AMD WX5100 in a Talos II with dual POWER9 CPUs. There are three lines in the dmesg output for the kernel with the broken display that seem suspicious: [ 4.418241] amdgpu: [powerplay] There must be 1 or more PCIE levels defined in PPTable. [ 4.418305] amdgpu: [powerplay] Failed to populate SCLK during PopulateNewDPMClocksStates Function! [ 4.418415] amdgpu: [powerplay] Failed to populate and upload SCLK MCLK DPM levels!
This only occurs when I have the firmware available for Petitboot to use the WX5100. When I remove the firmware from Petitboot the 4.17 kernel is able use the display.
Same bug here with 4.17.6-200 and an AMD WX7100, removing firmware from petitboot fixes the issue as well
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