<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen" href="https://bugs.freedesktop.org/show_bug.cgi?id=75502#c30">Comment # 30</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen" href="https://bugs.freedesktop.org/show_bug.cgi?id=75502">bug 75502</a> from <a class="email" href="mailto:simon@farnz.org.uk" title="Simon Farnsworth <simon@farnz.org.uk>"> Simon Farnsworth</a> <pre>With cacheline align and rc6 disabled, it doesn't hang - at the points where it would hang, libva crashes instead. With either rc6 enabled, or the flips not cacheline aligned, I can get hangs. There's an interesting commit in the VA-API driver (libva intel-driver) that's included in the 1.3.0pre1 release: commit 06702fb609b5fc9707f72a6e15e2117653ffd849 Author: Zhao Yakui <<a href="mailto:yakui.zhao@intel.com">yakui.zhao@intel.com</a>> Date: Mon Jan 20 09:58:06 2014 +0800 Fix the wrong setting in MI_BATCH_BATCH_START command on Snb/Ivy/Haswell Signed-off-by: Zhao Yakui <<a href="mailto:yakui.zhao@intel.com">yakui.zhao@intel.com</a>> This changes the MI_BATCH_BUFFER_START command from MI_BATCH_BUFFER_START | (2 << 6) to MI_BATCH_BUFFER_START | (1 << 8) (PPGTT bit set instead of 128 DWORDS size). Is it worth trying this commit against VA-API just in case?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>