[Bug 111581] New: General breakage with multiple monitors (affecting kde's yakuake and spectacle)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111581

            Bug ID: 111581
           Summary: General breakage with multiple monitors (affecting
                    kde's yakuake and spectacle)
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: not set
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: keziolio123 at gmail.com
        QA Contact: xorg-team at lists.x.org

Hi, I've been sent here from the kde bug tracker, here's the original issue
with all the info https://bugs.kde.org/show_bug.cgi?id=411652

video: https://youtu.be/zikzg5cDIrs

The two major things are:
1) spectacle's "rectangular region" mode is shifted to the left, and I can't
screenshot the left part of the desktop
2) yakuake doesn't show up on a monitor, or, with two monitors, it shows but
with a smaller / wrong width 

This seems to also glitch part of some applications, for example QtCreator
works "better" on the left monitor, on the rightmost one it tends to glitch and
not update the screen / render some panels with wrong size

some times if I move a windows in the rightmost monitor, the cursor teleports
to the left one while the windows remains on the right


STEPS TO REPRODUCE
1. attach more than one monitor (tested with 2 and 3 4k monitors)
2. admire the breakage

I can reproduce this with another clean user, so it shouldn't be a
configuration issue

ArchLinux with everything up to date and RX480

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