[Bug 98097] New: [Regression, bissected] [EXA, TearFree] Visual corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98097

            Bug ID: 98097
           Summary: [Regression, bissected] [EXA, TearFree] Visual
                    corruption
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: arzeth0 at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 127030
  --> https://bugs.freedesktop.org/attachment.cgi?id=127030&action=edit
errors in dmesg (1366x768 (LVDS) and 1920x1080 (VGA) monitors) on linux
4.4.0-36

GPU: Mobility Radeon HD 5470 512MB (I don't have any integrated GPU).
Linux kernel 4.4.0-36-lowlatency x86_64. Also the same happens on 4.8.0.
Ubuntu 16.04 with Padoka PPA.

If "AccelMethod" is "Glamor" and "TearFree" is "Off", then all is ok.
If "AccelMethod" is "Glamor" and "TearFree" is "On", then all is ok.
If "AccelMethod" is "EXA"    and "TearFree" is "Off", then all is ok.
If "AccelMethod" is "EXA"    and "TearFree" is "On", then every ~0.1-~3.0
seconds (I guess some app is rerendering something...) my display shows one of
2-3 almost random visual messes (I guess it's random parts of random images
from VRAM... And at one time 100% of my screen was RGB noise.).
The mouse cursor and its animation always looks ok unless I set Option
"SWcursor" "on".

Option "DRI" "3" doesn't fix the bug.
Option "EXAPixmaps" "off" doesn't fix the bug.

No errors in Xorg.log.

(I selected bug severity=critical because I think a tear-free experience is a
must-have in 2016.)

8523a733b6a5de6116a6332fefc871d4c32652d8 is the first bad commit
commit 8523a733b6a5de6116a6332fefc871d4c32652d8
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Mon Sep 12 18:54:33 2016 +0900

    Propagate failure from radeon_set_pixmap_bo

    (Ported from amdgpu commits c315c00e44afc91a7c8e2eab5af836d9643ebb88
     and 0d42082108c264568e2aadd15ace70e72388bc65)

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