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