[Bug 109122] blank screen on rx580 starting with kernel 4.19.9

[Bug 109122] blank screen on rx580 starting with kernel 4.19.9

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109122

            Bug ID: 109122
           Summary: blank screen on rx580 starting with kernel 4.19.9
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: velemas@gmail.com

After upgrading to kernel 4.19.9 in Arch Linux I have a blank screen. The
system is unusable.

My system is Asus ROG GL702ZC with RX 580:

lspci output:
description: VGA compatible controller
product: Ellesmere [Radeon RX 470/480/570/570X/580/580X]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:0c:00.0
version: c1
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=amdgpu latency=0

dmesg:
[drm] initializing kernel modesetting (POLARIS10 0x1002:0x67DF 0x1043:0x1A60
0xC1).

The culprit is
https://github.com/torvalds/linux/commit/07e3a1cfb0568b6d8d7862077029af96af6690ea

Reverting it fixed the issue. I also tried 4.20-rc7. There is no issue there.
But 4.19.11 still has it.

Setting amdgpu.dc=0 also helps with 4.19.9 - 4.19.11

Related https://bugs.archlinux.org/task/61117

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[Bug 109122] blank screen on rx580 starting with kernel 4.19.9

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https://bugs.freedesktop.org/show_bug.cgi?id=109122

Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach the corresponding output of dmesg.

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[Bug 109122] blank screen on rx580 starting with kernel 4.19.9

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https://bugs.freedesktop.org/show_bug.cgi?id=109122

--- Comment #2 from velemas@gmail.com ---
Created attachment 142872
  --> https://bugs.freedesktop.org/attachment.cgi?id=142872&action=edit
dmesg attachment with kernel 4.19.11 and amdgpu.dc=0

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[Bug 109122] blank screen on rx580 starting with kernel 4.19.9

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109122

--- Comment #3 from Matej Lach <me@matej-lach.me> ---
I can confirm this bug is indeed present. 
Worth noting that the screen is only blank on the laptop built-in display,
(after KMS), external monitors work fine. 

Adding `amdgpu.dc=0` to the kernel parameters resolves the issue for me, but
this was not necessary before kernel 4.19.9, so it seems like a regression. [1]
seems related.

1 - https://bugzilla.kernel.org/show_bug.cgi?id=200695

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[Bug 109122] blank screen on rx580 starting with kernel 4.19.9

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https://bugs.freedesktop.org/show_bug.cgi?id=109122

--- Comment #4 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
This should be fixed by: https://patchwork.freedesktop.org/patch/264792/

It's probably why you don't see the issue occur in 4.20-rc7.

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[Bug 109122] blank screen on rx580 starting with kernel 4.19.9

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https://bugs.freedesktop.org/show_bug.cgi?id=109122

--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> ---
Created attachment 142958
  --> https://bugs.freedesktop.org/attachment.cgi?id=142958&action=edit
possible fix

Looks like the stable patch autoselect strikes again!  Does this backported
patch fix the issue?

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[Bug 109122] blank screen on rx580 starting with kernel 4.19.9

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https://bugs.freedesktop.org/show_bug.cgi?id=109122

velemas@gmail.com changed:

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

--- Comment #6 from velemas@gmail.com ---
Thank you! This patch fixes the issue.

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