Bug 80218

Summary:	TearFree sometimes causes windows to not refresh properly with Kwin OpenGL compositing
Product:	xorg	Reporter:	Ildar Nurislamov <absorbb>
Component:	Driver/intel	Assignee:	Chris Wilson <chris>
Status:	RESOLVED NOTOURBUG	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Ildar Nurislamov 2014-06-19 08:31:00 UTC

Not sure if it mesa bug or driver or X - i update regularly all of them. Sometimes windows content is not refreshed. Easily noticeable if Kwin Vsync is also enabled (which is redundant of course). Faster way to reproduce - switch skype 4.3 from contacts view to history (gray button at the right side) few times. Harder to notice if kwin vsync is disabled. Also happened in Firefox. I think it is not application dependent. E.g. popup menu can not show up at all.
Started to happen maybe days or weeks ago. I dont use OpenGL compositing mostly.

Comment 1 Ildar Nurislamov 2014-06-19 08:36:58 UTC

Actually it seems that problem is not reproducible with kwin vsync off. It

Comment 2 Ildar Nurislamov 2014-06-19 08:37:32 UTC

... It lowers significance

Comment 3 Chris Wilson 2014-06-19 09:08:14 UTC

It's a bug in Kwin. They ignore notifications that the buffers change.


diff --git a/kwin/libkwineffects/kwinglplatform.cpp b/kwin/libkwineffects/kwinglplatform.cpp
index ae2f459..c41b9df 100644
--- a/kwin/libkwineffects/kwinglplatform.cpp
+++ b/kwin/libkwineffects/kwinglplatform.cpp
@@ -808,7 +808,6 @@ void GLPlatform::detect(OpenGLPlatformInterface platformInterface)
             m_supportsGLSL = false;
 
         m_limitedGLSL = m_supportsGLSL && m_chipClass < I965;
-        m_looseBinding = true;
 
         if (m_chipClass < I915) {
             m_recommendedCompositor = XRenderCompositing;

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