[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

            Bug ID: 107793
           Summary: Black screen on boot for Fedora 28 with 4.17 kernel
                    (i.e. with amdgpu.dc defaulted)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: simon.geard@gmail.com

Created attachment 141422
  --> https://bugs.freedesktop.org/attachment.cgi?id=141422&action=edit
Contents of /proc/cpuinfo on successful boot

My Fedora 28 desktop stopped booting up cleanly after switching to the 4.17
kernel where amdgpu.dc became the default... the system seems to be working
(e.g when installing updates, it automatically reboots once done), but the
screen goes black immediately after grub loads the kernel, and it remains that
way indefinitely. Passing "amdgpu.dc=0" on the kernel command line resolves the
problem.

The active graphics card is an AMD RX-470, the CPU is an AMD A10-7850k (with
unused onboard graphics).


This was logged on the RedHat bugzilla, but after receiving no response in over
a month, I've opted to log it here instead. Here's the link to the downstream
bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1601812

I've re-attached the same files provided there – the output of lspci, dmesg,
and /proc/cpuinfo for a successful boot – but if you need anything else to
track this down, let me know.

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #1 from Simon Geard <simon.geard@gmail.com> ---
Created attachment 141423
  --> https://bugs.freedesktop.org/attachment.cgi?id=141423&action=edit
Output of lspci on successful boot

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #2 from Simon Geard <simon.geard@gmail.com> ---
Created attachment 141424
  --> https://bugs.freedesktop.org/attachment.cgi?id=141424&action=edit
Output of dmesg on successful boot

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #3 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
If you can provide a dmesg log for your black screen boot that would help.

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

Simon Geard <simon.geard@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #141424|0                           |1
        is obsolete|                            |

--- Comment #4 from Simon Geard <simon.geard@gmail.com> ---
Created attachment 141459
  --> https://bugs.freedesktop.org/attachment.cgi?id=141459&action=edit
Output of journalctl -k on failed boot

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #5 from Simon Geard <simon.geard@gmail.com> ---
Created attachment 141460
  --> https://bugs.freedesktop.org/attachment.cgi?id=141460&action=edit
Output of journalctl -k on successful boot

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #6 from Simon Geard <simon.geard@gmail.com> ---
Ok, I've added the output of "journalctl -k -b" (the current, successful boot)
and "journalctl -k -b -1" (a failed boot a few minutes previously).

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #7 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
Can you try booting with amdgpu.dc=0 in your kernel boot parameters?

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #8 from Simon Geard <simon.geard@gmail.com> ---
(In reply to Nicholas Kazlauskas from comment #7)
> Can you try booting with amdgpu.dc=0 in your kernel boot parameters?

As noted in the original bug report, "passing "amdgpu.dc=0" on the kernel
command line resolves the problem." The "successful boot" logs I've provided
were all captured under that setting, since the system is unusable without it.

I *suspect* the system is booting fine apart from the graphics, because when
Fedora reboots to apply updates, it does so successfully before powering off as
expected – I just can't see anything on the screen.

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #9 from 8zST4a7dHsqbqXeQ@tuta.io ---
Just to add - Same happens to me with an R9 380 graphics card since amdgpu.dc
was enabled. I am using my monitor through the vga port (with an dvi to vga
adapter on my gpu). Passing "amdgpu.dc=0" also resolves the problem for me. Is
there any debug that I should provide that may help?

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #10 from ZLD <8zST4a7dHsqbqXeQ@tuta.io> ---
Created attachment 141483
  --> https://bugs.freedesktop.org/attachment.cgi?id=141483&action=edit
output of journalctl on failed boot with amdgpu.dc=1 amdgpu.dc_log=1

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

--- Comment #11 from Simon Geard <simon.geard@gmail.com> ---
Is there any update on this, any more information I can provide to help get
this fixed? I can confirm it's still occurring on the 4.19.5-200 kernel
currently included in Fedora 28...

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[Bug 107793] Black screen on boot for Fedora 28 with 4.17 kernel (i.e. with amdgpu.dc defaulted)

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https://bugs.freedesktop.org/show_bug.cgi?id=107793

Martin Peres <martin.peres@free.fr> changed:

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

--- Comment #12 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/503.

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