[Bug 107049] monitor not found in 4.17+ kernel

[Bug 107049] monitor not found in 4.17+ kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

            Bug ID: 107049
           Summary: monitor not found in 4.17+ kernel
           Product: DRI
           Version: unspecified
          Hardware: PowerPC
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: dan@danny.cz
                CC: bcrocker@redhat.com

When booting kernel 4.17 or 4.18-pre on Power9 machine with Radeon Pro WX 4100
I get no output on a monitor connected thru DisplayPort, the monitor is not
detected by the driver and a "PowerPlay" error appears in the kernel log. When
booting 4.16 kernel (kernel-4.16.16-300.fc28.ppc64le), all is OK. See attached
dmesg (resp. journalctl -k -b) outputs.

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[Bug 107049] monitor not found in 4.17+ kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

--- Comment #1 from Dan Horák <dan@danny.cz> ---
Created attachment 140359
  --> https://bugs.freedesktop.org/attachment.cgi?id=140359&action=edit
boot log for 4.18.0-0.rc2.git2.1.fc29

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[Bug 107049] monitor not found in 4.17+ kernel

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

--- Comment #2 from Dan Horák <dan@danny.cz> ---
Created attachment 140360
  --> https://bugs.freedesktop.org/attachment.cgi?id=140360&action=edit
boot log for 4.16.16-300.fc28

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[Bug 107049] monitor not found in 4.17+ kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

--- Comment #3 from Dan Horák <dan@danny.cz> ---
No output is for the host OS (kernel), that's kexec-ed from the bootloader. I
see the petitboot output.

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[Bug 107049] monitor not found in 4.17+ kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com

--- Comment #4 from Michel Dänzer <michel@daenzer.net> ---
amdgpu.dc=0 on the kernel command line might serve as a workaround for now.

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[Bug 107049] monitor not found in 4.17+ kernel

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

--- Comment #5 from Dan Horák <dan@danny.cz> ---
(In reply to Michel Dänzer from comment #4)
> amdgpu.dc=0 on the kernel command line might serve as a workaround for now.

Thanks, it helps.

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[Bug 107049] monitor not found in 4.17+ kernel

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

--- Comment #6 from Ben Crocker <bcrocker@redhat.com> ---
Dan,

Could you please also post the respective /var/log/Xorg.* logs?
Thanks!

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[Bug 107049] monitor not found in 4.17+ kernel

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 323 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=107049

--- Comment #7 from Dan Horák <dan@danny.cz> ---
Created attachment 140364
  --> https://bugs.freedesktop.org/attachment.cgi?id=140364&action=edit
Xorg log for 4.18.0-0.rc2.git2.1.fc29

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[Bug 107049] monitor not found in 4.17+ kernel

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

--- Comment #8 from Dan Horák <dan@danny.cz> ---
Created attachment 140365
  --> https://bugs.freedesktop.org/attachment.cgi?id=140365&action=edit
Xorg log for 4.17.2-200.fc28 with amdgpu.dc=0

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[Bug 107049] monitor not found in 4.17+ kernel

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

--- Comment #9 from Dan Horák <dan@danny.cz> ---
Probably a good news, the amdgpu.dc=0 workaround isn't needed with 5.1-rc7
(haven't checked previous kernels yet).

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[Bug 107049] monitor not found in 4.17+ kernel

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

--- Comment #10 from Dan Horák <dan@danny.cz> ---
and the dc=0 was still required for 5.0, so sound like an improvement in 5.1

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[Bug 107049] monitor not found in 4.17+ kernel

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107049

Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #11 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Dan Horák from comment #10)
> and the dc=0 was still required for 5.0, so sound like an improvement in 5.1

Glad to hear it's fixed in 5.1! Thanks for the follow-ups, resolving
accordingly.

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