<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - libswrAVX2.so Causes hang with QOpenGLWidget" href="https://bugs.freedesktop.org/show_bug.cgi?id=100262#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - libswrAVX2.so Causes hang with QOpenGLWidget" href="https://bugs.freedesktop.org/show_bug.cgi?id=100262">bug 100262</a> from <a class="email" href="mailto:timothy.o.rowley@intel.com" title="Tim Rowley <timothy.o.rowley@intel.com>"> Tim Rowley</a> <pre>Ok, looks like I need to check and make sure there hasn't been a regression for this since Mesa 13. Are you using the dri version of the driver, or libgl-x11? Interesting that setting the variable fixed the problem for you. We've seen similar problems before with TBB (thread building blocks), where if we bound threads inside swr, their threading code would think no cpus were available for its use. Previously the workaround we've suggested is to initialize the threading library before creating an OpenGL context. If that's possible in Qt that would the cleanest way forward, though I could see that potentially being hard to do since it renders the UI with OpenGL as well. If used, for maximum performance MAX_KNOB_WORKER_THREADS should be the number of cores minus one (we have an API thread that feeds the workers).</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>