Bug 62614

Summary: [SNB] black screen when running 3D apps with vblank turned off
Product: DRI Reporter: Ivan Bulatovic <combuster>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium    
Version: XOrg git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
xorg log none

Description Ivan Bulatovic 2013-03-21 21:26:10 UTC 
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 !
Comment 1 Ivan Bulatovic 2013-03-21 21:31:17 UTC 
Forgot to mention that SNA is enabled !
Comment 2 Ivan Bulatovic 2013-03-21 21:37:04 UTC 
Created attachment 76879 [details]
xorg log
Comment 3 Chris Wilson 2013-03-21 22:55:23 UTC 
This is the root cause: http://lists.x.org/archives/xorg-devel/2012-September/033793.html

However, I can't fix up that breakage in the driver so I just have to go back to ignoring the issue:

commit 9f8e86800345d19785eae2dd2099dd7d61a7a3b3
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu Mar 21 22:48:06 2013 +0000

    sna/dri: Disable assertion and associated bookkeeping
    
    Due to long standing ignored bugs in DRI2, we have to accept breakage
    in the driver.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=62614
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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