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

[bugzilla-daemon at bugzilla.kernel.org]

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 at kernel-bugs.osdl.org
          Reporter: keziolio123 at 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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