Created attachment 1528242 [details] journalctl --no-hostname -k for kernel-4.20.5-100.fc28.x86_64 1. Please describe the problem: Starting from kernel-4.20.5-100.fc28.x86_64, the plymouth bootup screen, as well as the textual framebuffer is garbled (see attached photos), and the wayland graphical login never starts up. Instead, the monitor goes into power save (no video signal). There is no recovery from this state, and I have to power cycle the computer. 2. What is the Version-Release number of the kernel: kernel-4.20.5-100.fc28.x86_64 kernel-4.20.6-100.fc28.x86_64 3. Did it work previously in Fedora? If so, what kernel version did the issue *first* appear? Old kernels are available for download at https://koji.fedoraproject.org/koji/packageinfo?packageID=8 : All is fine on kernel-4.20.4-100.fc28.x86_64, albeit that I have to disable amdgpu dc (options amdgpu dc=0), because it causes screen flicker. It appears dc was enabled by default since kernel 4.20, whereas it was disabled by default before that. 4. Can you reproduce this issue? If so, please provide the steps to reproduce the issue below: Boot up, amdgpu dc setting does not matter. 5. Does this problem occur with the latest Rawhide kernel? To install the Rawhide kernel, run ``sudo dnf install fedora-repos-rawhide`` followed by ``sudo dnf update --enablerepo=rawhide kernel``: Yes, kernel-5.0.0-0.rc4.git3.1.fc30.x86_64 exhibits the same problem. 6. Are you running any modules that not shipped with directly Fedora's kernel?: No. 7. Please attach the kernel logs. You can get the complete kernel log for a boot with ``journalctl --no-hostname -k > dmesg.txt``. If the issue occurred on a previous boot, use the journalctl ``-b`` flag. feb 08 22:50:34 kernel: [drm:atom_op_jump [amdgpu]] *ERROR* atombios stuck in loop for more than 5secs aborting feb 08 22:50:34 kernel: [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing D6A0 (len 978, WS 0, PS 0) @ 0xD7EF feb 08 22:50:34 kernel: [drm:amdgpu_atom_execute_table_locked [amdgpu]] *ERROR* atombios stuck executing D55A (len 326, WS 0, PS 0) @ 0xD5F6
Created attachment 1528243 [details] journalctl --no-hostname -k for kernel-4.20.4-100.fc28.x86_64
Created attachment 1528244 [details] journalctl --no-hostname -k for kernel-4.20.6-100.fc28.x86_64
Created attachment 1528245 [details] journalctl --no-hostname -k for kernel-5.0.0-0.rc4.git3.1.fc30.x86_64
Created attachment 1528246 [details] Photo of garbled plymouth boot screen
Created attachment 1528247 [details] Photo of garbled bootup text framebuffer
Created attachment 1528248 [details] Output of lshw Hardware: - AMD Ryzen 1600X CPU - Asus B350M-A PRIME motherboard, BIOS version 4207 - MSI Radeon RX 560 AERO ITX 4G OC graphics card - Philips 276E8VJSB (4K) monitor
Created attachment 1528249 [details] Output of dmidecode
Created attachment 1538096 [details] journalctl --no-hostname -k for kernel-4.20.8-100.fc28.x86_64 Problem still occurs with kernel-4.20.8-100.fc28.x86_64
Reported upstream bug at https://bugzilla.kernel.org/show_bug.cgi?id=202667
See upstream bug for discussion.