[Bug 95414] New: [SNA HSW] Corruption in OpenGL video output and DDX with VGA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95414

            Bug ID: 95414
           Summary: [SNA HSW] Corruption in OpenGL video output and DDX
                    with VGA
           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

After my main monitor with DVI-D input giving up the ghost today, I had to
switch to older one that only has VGA input. This revealed some weird
corruption issues in OpenGL video output of MPV and also other draw issues.
Notably, Xv output with MPV does not seem to exhibit the problem. I haven't
experienced any other problems with OpenGL - games such as QuakeForge /
DarkPlaces, ET:Legacy, etc. work without visual issues.

As the only thing that has changed is switching from DVI to VGA, I can only
assume that this is related. The graphics stack is reasonably up to date, DDX
is from Git.

The below link has two video captures taken with a camera, demonstrating the GL
video output weirdness. Also included are two full-debug Xorg logs.

http://tnsp.org/~ccr/intel-gfx/gl-ddx-vga/

Unfortunately I can only now test on VGA, until I get a new DVI/HDMI monitor.

-- Window manager: WindowMaker 0.95.6+b1
-- 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 88733a7874f7c9b45da5d612802947a9de12893a
-- xserver: X.Org X Server 1.18.3-1 from latest Debian testing
-- mesa: 11.1.3-1 from Debian testing
-- libpixman: 0.33.6-1
-- libdrm version: 2.4.68-1
-- kernel version: 4.5.4 (vanilla+grsec)
-- Linux distribution: current Debian Testing
-- Machine or mobo model: Asus H97M-PLUS, core i7-4770
-- Display connector: VGA

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