[Bug 69869] New: [IVB/HSW bisected]mplayer can't play video smoothly enabling SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69869

          Priority: high
            Bug ID: 69869
          Assignee: chris at chris-wilson.co.uk
           Summary: [IVB/HSW bisected]mplayer can't play video smoothly
                    enabling SNA
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: cancan.feng at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 86705
  --> https://bugs.freedesktop.org/attachment.cgi?id=86705&action=edit
Xorg.0.log

Environment:
----------------------------
 Libdrm:       
(master)libdrm-2.4.46-42-gbf4a7cd4b2456d4dc93a86bbcc51eba4ae73390a
 Mesa:        (master)fe2528c0b69d5719b15d926ada9424cac7569b9c
 Xserver:       
(master)xorg-server-1.14.99.1-215-g7d3d4ae55dd6ee338439e2424ac423b1df80501b
 Xf86_video_intel:       
(master)2.99.902-54-gd7eb40efa79dd9ea720606b94a20179c7dd18e03
 Cairo:        (master)337ab1f8d9e29086bfb4001508b28835b41c6390
 Libva:        (staging)f5c913765e6af38d835cacf339054ccc60bddefb
 Libva_intel_driver:        (staging)f6685c309d94fb7679c9772703c8790cb71cdd73
 Kernel:    (drm-intel-nightly) 24c8329416b54b79655afe45370cf3d46f41e283

Bug Details Description:
----------------------------
Mplayer can't play video smoothly after starting X, this issue happens with SNA
enabled, and it will disappear with SNA disabled. This is a xf86_video_intel
regression:

dbe75982457cfe6bb1f7422a517ced32cc74f909 is the first bad commit
commit dbe75982457cfe6bb1f7422a517ced32cc74f909
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Sep 9 15:35:42 2013 +0100

    sna/hsw: Fix the event selection for scanline waits on pipe A

Reproduce Steps:
------------------------------
1. xinit&
2. mplayer -vo xv /home/testframework/MPEG-2.mpeg

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