[Bug 195743] New: Screen flicker and instability on hdmi monitors with AMDGPU, EDID problems

[Bug 195743] New: Screen flicker and instability on hdmi monitors with AMDGPU, EDID problems

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=195743

            Bug ID: 195743
           Summary: Screen flicker and instability on hdmi monitors with
                    AMDGPU, EDID problems
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.10.13
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: keziolio123@gmail.com
        Regression: No

Hi, I want to report the bug described in this forum thread:
https://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/open-source-amd-linux/947352-recent-extremely-annoying-multimonitor-bug-don-t-know-where-to-report

I'll copy the relevant part for convenience:

"basically it acts like monitors are unplugged and plugged back in, and often
the detected EDID is wrong, like dmesg suggests, wrong resolutions are found
and I remain with one monitor right, one in 1024*768 and the other one off, not
even detected.
This happens only with HDMI monitors, the one DVI monitor that I have seems to
always work reliably, and swapping them has no effect, the left one seems to
have always the same problems (wrong resolution).

In the video, the center monitor is DVI, the other two are identical, connected
with hdmi and are affected by the problem.


I'm 100% sure everything was working right until some weeks ago, never had any
issues with xonotic or cheese in years, i've reproduced also with serious sam
fusion beta

GPU is a sapphire RX480"

Here's a youtube video of the problem:
https://www.youtube.com/watch?v=Tfu_pxRVHag

The system now is basically unusable with multiple monitors and 3d apps, with
continuous flicker

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[Bug 195743] Screen flicker and instability on hdmi monitors with AMDGPU, EDID problems

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=195743

--- Comment #1 from keziolio123@gmail.com ---
Created attachment 256503
  --> https://bugzilla.kernel.org/attachment.cgi?id=256503&action=edit
dmesg output with the problem, and an xrandr segfault

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[Bug 195743] Screen flicker and instability on hdmi monitors with AMDGPU, EDID problems

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=195743

--- Comment #2 from Michel Dänzer (michel@daenzer.net) ---
Did you update to a newer kernel version when the problem started, or what
changed?

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[Bug 195743] Screen flicker and instability on hdmi monitors with AMDGPU, EDID problems

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=195743

--- Comment #3 from keziolio123@gmail.com ---
Thanks for the reply 

Yes I did update the kernel, along with the rest of the system (I use
ArchLinux).

The problem seems to be getting worse, from linux 4.7 to 4.10 and git, with
latter versions the "screens off and on" flicker seems to be cycling and
generally more unstable (on 4.10), instead of an "one shot" glitch that I can
fix with xrandr (on 4.7). This is why I think it's a kernel issue.

Unfortunately for now I can't easily bisect the kernel version, as I use btrfs
and it breaks if I load an old kernel. I'll try later with a live system but
that's going to take some time.

I have 3 monitors, two of them HDMI and one DVI, only the HDMI ones are
affected, even if I found breakage on the DVI one some times.


The problem does not occur in wayland, only xorg is affected. But I tried older
versions of xorg and the problem persists (so I guess it's not a xorg issue)

I tried to force the edid with the kernel command line, but the problem still
occurs, the monitors do shut down (they are not detected) or flicker

I don't really know what to try now, and I have not found a workaround yet,
disabling udev has no effect.

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[Bug 195743] Screen flicker and instability on hdmi monitors with AMDGPU, EDID problems

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=195743

keziolio123@gmail.com changed:

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

--- Comment #4 from keziolio123@gmail.com ---
That was probably an hardware issue, closing

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