[Bug 101558] [regression][bisected] MPV playing video via opengl "randomly" results in only part of the window / screen being rendered with Mesa GIT.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101558

            Bug ID: 101558
           Summary: [regression][bisected] MPV playing video via opengl
                    "randomly" results in only part of the window / screen
                    being rendered with Mesa GIT.
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: ccr at tnsp.org
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 132141
  --> https://bugs.freedesktop.org/attachment.cgi?id=132141&action=edit
Screenshot of bugged rendering.

Mesa GIT commit b7153c3e9f9d2d430b0338313587a00e531e4800 "i965: Call
intel_prepare_render() from intel_update_state()" causes a regression with MPV
OpenGL video output at least on Haswell, resulting occasionally in partially
rendered window (or screen, in case of fullscreen). The problem tends to
persist, e.g. seeking or such does not get rid of it. Restarting MPV may
sometimes result in correct rendering, but switching to fullscreen may result
in broken rendering again.

Reverting the commit on top of Mesa GIT head "fixes" the problem, but is
probably not a good solution as the change is supposed to fix other issues.

Screenshot of buggy rendering attached.

-- Linux distribution: Debian GNU/Linux 9.0 (stretch)
-- System architecture: amd64
   Foreign architectures: i386
-- Machine: Asus H97M-PLUS, Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
-- Kernel version: 4.9.33-grsec
-- Chipset: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated
Graphics Controller (rev 06)
-- Display connector(s): HDMI (2560x1440)
-- Window manager: WindowMaker 0.95.7-8
-- xf86-video-intel: GIT 
-- X server: Xorg 2:1.19.3-1
-- libpixman: 0.34.0-1
-- libdrm version: GIT b9549c954e190010a79e6691983b6ae16eac83d5

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