https://bugzilla.kernel.org/show_bug.cgi?id=205049
--- Comment #5 from lechp@onet.pl --- Ok, this is what I've tried: holding shift to force the boot menu to show up, then pressing e to edit the options for kernel version 5.2.17, then appending amdgpu.ppfeaturemask=0xffff3fff, and finally pressing Ctrl-x.
If I add a space and put the text at the end of the last line with text already on it, the error appears for a few seconds, then the Lenovo splash screen appears indefinitely and nothing else happens until I cycle the power.
On the other hand, if I put the text on a new line, there's no error message and Fedora boots normally, but the graphics issues persist. I tried a total of 6 different boot edits with amdgpu.ppfeaturemask=0xffff3fff, amdgpu.ppfeaturemask=0xfffdbfff, and amdgpu.ppfeaturemask=0xfffd3fff, with the same result each time.