[Bug 205523] New: AMDGPU display lockup during boot with 5.4 RC on Ryzen 2700u

[Bug 205523] New: AMDGPU display lockup during boot with 5.4 RC on Ryzen 2700u

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205523

            Bug ID: 205523
           Summary: AMDGPU display lockup during boot with 5.4 RC on Ryzen
                    2700u
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4.0-rc7
          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: briancschott@gmail.com
        Regression: No

Created attachment 285907
  --> https://bugzilla.kernel.org/attachment.cgi?id=285907&action=edit
journalctl output

I'm getting a black screen on boot when testing the 5.4 release candidate
kernels on a Dell Inspiron 7375 laptop. The system responds to the magic sysrq,
so the kernel is not completely dead, but the display is. The system boots
correctly with a 5.3.1 kernel. The log showing the stack trace is attached.
I'll start working on bisecting the problem soon.

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[Bug 205523] AMDGPU display lockup during boot with 5.4 RC on Ryzen 2700u

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205523

--- Comment #1 from briancschott@gmail.com ---
1c4259159132ae4ceaf7c6db37a6cf76417f73d9 is the first bad commit
commit 1c4259159132ae4ceaf7c6db37a6cf76417f73d9
Author: Shirish S <shirish.s@amd.com>
Date:   Tue Jul 16 14:49:48 2019 +0530

    drm/amd/display: enable S/G for RAVEN chip

    enables gpu_vm_support in dm and adds
    AMDGPU_GEM_DOMAIN_GTT as supported domain

    v2:
    Move BO placement logic into amdgpu_display_supported_domains

    v3:
    Use amdgpu_bo_validate_uswc in amdgpu_display_supported_domains.

    v4:
    amdgpu_bo_validate_uswc moved to sepperate patch.

    Signed-off-by: Shirish S <shirish.s@amd.com>
    Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
    Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

 drivers/gpu/drm/amd/amdgpu/amdgpu_display.c       | 2 +-
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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[Bug 205523] AMDGPU display lockup during boot with 5.4 RC on Ryzen 2700u

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205523

Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #2 from Alex Deucher (alexdeucher@gmail.com) ---
Does disabling the IOMMU help?  Set iommu=off or iommu=pt on the kernel command
line.

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[Bug 205523] AMDGPU display lockup during boot with 5.4 RC on Ryzen 2700u

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205523

--- Comment #3 from briancschott@gmail.com ---
"iommu=off" seems to work, "iommu=pt" does not.

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[Bug 205523] AMDGPU display lockup during boot with 5.4 RC on Ryzen 2700u

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205523

Haxk20 (haxk612@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |haxk612@gmail.com

--- Comment #4 from Haxk20 (haxk612@gmail.com) ---
(In reply to Alex Deucher from comment #2)
> Does disabling the IOMMU help?  Set iommu=off or iommu=pt on the kernel
> command line.

Is this permanent too ? This will regress and produce tearing in games running
with PRIME setup.

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