[Bug 94125] New: [SNA HSW bisected] git commit "sna: Skip sync if we have an idle coherent bo" causes corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94125

            Bug ID: 94125
           Summary: [SNA HSW bisected] git commit "sna: Skip sync if we
                    have an idle coherent bo" causes corruption
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: ccr at tnsp.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121723
  --> https://bugs.freedesktop.org/attachment.cgi?id=121723&action=edit
Example screenshot of corruption.

DDX git commit 963b5bb1be874623f06caa421e06cdd2134204dc causes partially
invalid screen updates / weirdness in some applications ("xv" image viewer and
(paused) html5 video in Firefox at least).

Most easily reproduced when switching between virtual desktops (in WindowMaker)
and having "xv" on one desktop and something else, like Firefox on another
vdesktop. Not sure if so "complex" setup is required, but it seemed to trigger
the issue more easily.

Reverting this commit on top of git head fixes the issue.


-- Window manager: WindowMaker 0.95.7-3
-- chipset: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated
Graphics Controller (rev 06)
-- system architecture: x86-64 / 64bit
-- xf86-video-intel: GIT head/master de7407d20703615c5bf0b1d9f522e93dcc13ba82
-- xserver: X.Org X Server 1.18.0 from latest Debian testing
-- mesa: 11.1.1-2 from Debian testing
-- libpixman: 0.33.6-1
-- libdrm version: 2.4.66-2
-- kernel version: 4.3.5 (vanilla+grsec)
-- Linux distribution: current Debian Testing
-- Machine or mobo model: Asus H97M-PLUS, core i7-4770
-- Display connector: DVI

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