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

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

[bugzilla-daemon]

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@kernel-bugs.osdl.org
          Reporter: dwagelaar@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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[Bug 202667] amdgpu fails to boot: atombios stuck executing D6A0

[bugzilla-daemon]

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

--- Comment #1 from Michel Dänzer (michel@daenzer.net) ---
Please attach the corresponding full output of dmesg.

Can you bisect between 4.20.4 and 4.20.5?

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

[bugzilla-daemon]

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

--- Comment #2 from Dennis Wagelaar (dwagelaar@gmail.com) ---
Created attachment 281333
  --> https://bugzilla.kernel.org/attachment.cgi?id=281333&action=edit
journalctl --no-hostname -k for kernel-4.20.4-100.fc28.x86_64

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

[bugzilla-daemon]

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

--- Comment #3 from Dennis Wagelaar (dwagelaar@gmail.com) ---
Created attachment 281335
  --> https://bugzilla.kernel.org/attachment.cgi?id=281335&action=edit
journalctl --no-hostname -k for kernel-4.20.5-100.fc28.x86_64

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

[bugzilla-daemon]

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

--- Comment #4 from Michel Dänzer (michel@daenzer.net) ---
The attached output from 4.20.4 shows DC being enabled. Does the problem really
not happen with 4.20.4 and DC disabled?

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

[bugzilla-daemon]

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

--- Comment #5 from Dennis Wagelaar (dwagelaar@gmail.com) ---
Created attachment 281337
  --> https://bugzilla.kernel.org/attachment.cgi?id=281337&action=edit
Active kernel module parameters for 4.20.4

Hmm, I have:

options amdgpu dc=0

in /etc/modprobe.d/amdgpu.conf, but my active module parameters say DC is
enabled anyway...

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

[bugzilla-daemon]

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

--- Comment #6 from Dennis Wagelaar (dwagelaar@gmail.com) ---
Created attachment 281339
  --> https://bugzilla.kernel.org/attachment.cgi?id=281339&action=edit
journalctl --no-hostname -k for kernel-4.20.8-100.fc28.x86_64 with amdgpu.dc=1

Just found out changing stuff in /etc/modprobe.d/ has no effect until the next
run of dracut :$

It turns out I can no longer use amdgpu without DC=1. With that enabled, the
newer kernel run as normal.

What probably happened is that I saw the flicker once, which is mentioned here:
https://wiki.archlinux.org/index.php/AMDGPU : "If you experience flickering add
amdgpu.dc=0 to your kernel parameters." That's when trouble began.

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

[bugzilla-daemon]

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

Dennis Wagelaar (dwagelaar@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

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