[Bug 95475] New: DRI3 screen corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95475

            Bug ID: 95475
           Summary: DRI3 screen corruption
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: majhen.ivan at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 123886
  --> https://bugs.freedesktop.org/attachment.cgi?id=123886&action=edit
chromium right click

With DRI3 set as default in radeon driver, screen corruption appears in plasma
taskmanager, system tray widgets and firefox&chromium right click menus.


DRI3 with glamour doesn't have this corruption, only EXA and XAA.

Corruption also happens if desktop effect are disabled in Kwin.

With DRI2 enabled, rendering is bug free.

This is rather old laptop graphics VGA compatible controller: Advanced Micro
Devices, Inc. [AMD/ATI] RV530/M56-P [Mobility Radeon X1600].

Using glamour is not an option since it is slower and results in higher 
graphics card temperatures. 

Kernel is 4.5, Xorg-server 1.18.3, gentoo linux.

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