[Bug 202667] New: amdgpu fails to boot: atombios stuck executing D6A0

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=202667

            Bug ID: 202667
           Summary: amdgpu fails to boot: atombios stuck executing D6A0
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.20.5
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: dwagelaar at gmail.com
        Regression: No

Starting from kernel 4.20.5, the plymouth bootup screen, as well as the textual
framebuffer is garbled (see https://bugzilla.redhat.com/show_bug.cgi?id=1674065
for attachments), 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.

All is fine on kernel-4.20.4, 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.

Suspicious dmesg output:

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

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

Software:
- Fedora 28 x86_64

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