[Bug 96742] New: Display corruption on scrolling window

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96742

            Bug ID: 96742
           Summary: Display corruption on scrolling window
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: terry at beam.ltd.uk
        QA Contact: xorg-team at lists.x.org

Created attachment 124792
  --> https://bugs.freedesktop.org/attachment.cgi?id=124792&action=edit
Picture showing corruption

When an nedit window is scrolled the display becomes mangled. This happens with
some other applications but otherwise system and display is fine. Attachment
shows corruption.

Nedit is a simple text editor based on the Motif widget set.

Does not happen when the nedit window is at the top left of the first screen.

If I set (Option "ShadowPrimary" "on") this fixes the problem. This is the work
around but I'm not sure if this will mess up performance or other things.

Hardware is older Dual Xeon with graphics board: [AMD/ATI] Oland PRO [Radeon R7
240/340]. Dual monitors in use on HDMI and DVI.

Software is Fedora23 with all updates to date. Uses radeon driver:
xorg-x11-drv-ati-7.6.1-3.20160215gitd41fccc.fc23.x86_64, kernel:
4.5.7-200.fc23.x86_64.
GUI is KDE/Plasma with compositing enabled as per default.

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