<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [snb 3.5] *ERROR* Hangcheck timer elapsed... blitter ring idle" href="https://bugs.freedesktop.org/show_bug.cgi?id=54226#c9">Comment # 9</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [snb 3.5] *ERROR* Hangcheck timer elapsed... blitter ring idle" href="https://bugs.freedesktop.org/show_bug.cgi?id=54226">bug 54226</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>Looks that corresponds to the bug commit 1c8b46fc8c865189f562c9ab163d63863759712f Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Date: Wed Nov 14 09:15:14 2012 +0000 drm/i915: Use LRI to update the semaphore registers The bspec was recently updated to remove the ability to update the semaphore using the MI_SEMAPHORE_BOX command, the ability to wait upon the semaphore value remained. Instead the advice is to update the register using the MI_LOAD_REGISTER_IMM command. In cursory testing, semaphores continue to function - the question is whether this fixes some of the deadlocks where the semaphore registers contained stale values? hopefully addresses. That patch is only available on drm-intel-next at the moment, which is available either at <a href="http://cgit.freedesktop.org/~danvet/drm-intel">http://cgit.freedesktop.org/~danvet/drm-intel</a> or available as drm-intel-experimental in the ubuntu kernel-ppa.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>