[Bug 105824] New: RX 550: Screen corruption with compton (regression)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105824

            Bug ID: 105824
           Summary: RX 550: Screen corruption with compton (regression)
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: freedesktop at treblig.org
        QA Contact: xorg-team at lists.x.org

Created attachment 138455
  --> https://bugs.freedesktop.org/attachment.cgi?id=138455&action=edit
screenshot showing corruption; xfce+compton compositor.

Just upgraded from fedora 27->fedora 28 beta-ish; mostly seems fine; except
with the Compton compositor, where all of the xfce widgetry is a strange
orangey/red/corrupt; other windows (e.g. Firefox) seems fine.  f27 was fine as
well.
The attached screenshot shows the panel which is a boring grey; the icon to the
left is a red terminator terminal; and that speaker is black.

on f28 I have:

Graphics:  Card: Advanced Micro Devices [AMD/ATI] Lexa PRO [Radeon RX 550]
           Display Server: x11 (X.org 119.6 )
           drivers: modesetting,ati (unloaded: fbdev,vesa,radeon)
           Resolution: 3840x2160 at 60.00hz, 1920x1080 at 60.00hz
           OpenGL: renderer: Radeon RX 550 Series (POLARIS12 / DRM 3.23.0 /
4.16.0-0.rc7.git0.1.fc28.x86_64, LLVM 6.0.0)
           version: 4.5 Mesa 18.0.0-rc4

mesa-dri-drivers-18.0.0-0.3.rc4.fc28.x86_64
xorg-x11-server-Xorg-1.19.6-5.fc28.x86_64
xorg-x11-drv-ati-7.10.0-2.fc28.x86_64

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