[Bug 108294] Turning off monitor via DisplayPort causes Kernel warning + stack trace

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=108294

            Bug ID: 108294
           Summary: Turning off monitor via DisplayPort causes Kernel
                    warning + stack trace
           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: jamespharvey20@gmail.com

Created attachment 141955
  --> https://bugs.freedesktop.org/attachment.cgi?id=141955&action=edit
kernel warning + stack trace - from when HDMI monitor is turned off and back on

Up to date Arch Linux, including: linux 4.18.12.arch1-1, xf86-video-amdgpu
18.1.0-1, mesa 18.2.2-1, opencl-mesa 18.2.2-1, xorg-server 1.20.1-1, and
plasma-desktop 5.13.5-1.

(Recently installed system that STARTED with: linux 4.18.9.arch1-1, mesa
18.2.1-1, and opencl-mesa 18.2.1-1.)  It was also doing this then.

$ lspci -k | grep VGA
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Ellesmere [Radeon RX 470/480/570/570X/580/580X] (rev e7)
        Subsystem: XFX Pine Group Inc. Ellesmere [Radeon RX
470/480/570/570X/580/580X]
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu

It's the: XFX AMD Radeon RX 580 GTS Black Edition 8GB GDDR5 PCI Express 3.0

I have (5) Acer K272HUL bmiidp monitors hooked up via DisplayPort.  Left 2 are
chained, and right 2 are chained.

ASRock EP2C602 Motherboard w/ P1.90 BIOS.  (2) Intel Xeon E5-2690 (v1).

Anytime a monitor turns off, it causes a couple of kernel warnings and stack
traces.  Usually 2-3 warnings each time.

When the monitor turns back on, it just logs what are I think are (3) expected
"[drm]" lines about the "new" connection.

See attached file for a sample of the kernel warnings/stack traces.  The first
part is when a monitor turned off, and the last part is when it turned back on.

By turned off/on, I mean regardless of if I press its power button on the
monitor, pull the plug and plug it back in, or if a graphics issue somewhere in
a driver or graphics API turns off a monitor until I cycle it.

The only time I'm having this now is occasionally a few programs that use
OpenGL graphics.  (Monitors turning off/back on was happening a lot with the
Acer-provided DisplayPort cables, but replacing them with certified Accell
UltraAV DisplayPort cables fixed that.)

When I turn it back on, KDE/Plasma properly re-adds it, gives it the right
resolution, rotation, and alignment next to the other monitors.

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