[Bug 62614] New: [SNB] black screen when running 3D apps with vblank turned off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=62614

          Priority: medium
            Bug ID: 62614
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB] black screen when running 3D apps with vblank
                    turned off
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: combuster at archlinux.us
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

After xf86-video-intel 2.21.5 upgrade, when I try to run any 3D apps (windowed
or fullscreen) with wait for vblank turned of I get only blank content of the
window/app. Testcase:

vblank_mode=0 glxgears

window content is black

without vblank_mode=0, glxgears run just fine

After downgrading to 2.21.4 I can't reproduce the bug anymore.

Tried several times upgrading/downgrading and testcase was 100% reliable.

Intel HD2000 (i5-2400)
xf86-video-intel 2.21.5
mesa 9.1.1
xorg-server 1.14.0

There are no error messages in Xorg.0.log, dmesg, no errors in i915_error_state

Thanks !

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