Created attachment 97159 [details] Screenshot of white stripes in KDE with mesa >8 On computers with INTEL video card (Ivy bridge), Ubuntu 12.04.4 (KDE4.8) and 14.04 (KDE4.11.x?) I can see graphical corruption: white stripes, 3D games like HeroesOfNewerth have graphical corruptions too. Sometimes it scramble even cursor of mouse. The problem probably is not in KDE, because Unity has some problems too. I tried to downgrade the mesa in 12.04 to MESA 8 and it resolved it. But in Ubuntu 14.04 I cannot do that. Reproducible: Always Steps to Reproduce: 1. Install Ubuntu 12.04.4 (with mesa 9) or 14.04 (with mesa 10.1) 2. Install KDE 3. Use KDE and look at white-stripped graphical corruption and in-games graphical corruption. Actual Results: You can see white stripes corruption in KDE and strange rectangular corruption in 3D games.
Thanks for the information! Having to downgrade all the way to Mesa 8 strongly suggests multisampling is at fault. Although we suspect multisampling is broken, KWin and Unity really don't want to be using multisampling. The reason they're getting MSAA is due to a GLX bug in the X server, which chooses random visuals/fbconfigs that sometimes have really undesirable properties. This is fixed in X server 1.15.1 and 1.14.6. As an alternative, you can try running KWin with EGL: KWIN_OPENGL_INTERFACE=egl kwin --replace & *** This bug has been marked as a duplicate of bug 77207 ***
Well I do not think it is the duplicate, because what you adviced me did NOT help. I tried... KWIN_OPENGL_INTERFACE=egl kwin --replace & .... tom@tomas-Lenovo-C440:~$ KWIN_OPENGL_INTERFACE=egl kwin --replace & [1] 16071 tom@tomas-Lenovo-C440:~$ QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave. OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Desktop OpenGL version string: 3.0 Mesa 9.2.1 OpenGL shading language version string: 1.30 Driver: Intel GPU class: Unknown OpenGL version: 3.0 GLSL version: 1.30 Mesa version: 9.2.1 X server version: 1.14.5 Linux kernel version: 3.11 Direct rendering: yes Requires strict binding: yes GLSL shaders: yes Texture NPOT support: yes And it still show the white corruptions.
*** This bug has been marked as a duplicate of bug 77207 ***
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