<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED --- - [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)" href="https://bugs.freedesktop.org/show_bug.cgi?id=54226#c190">Comment # 190</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED --- - [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)" 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>(In reply to <a href="show_bug.cgi?id=54226#c189">comment #189</a>) > Hi Chris, > > OK, nothing of the above was the reason. In my case it's simply this: > > /etc/X11/xorg.conf.d/20-intel.conf > > Section "Device" > Identifier "Intel Graphics" > Driver "intel" > Option "TearFree" "true" > EndSection > > > I added it when the tearing scrolling through large webpages annoyed me. > As soon as I added it, the problems quickly started. > > Selfmade problem. Not really, <a class="bz_bug_link bz_status_NEW " title="NEW --- - [snb] TearFree now triggers stuck semaphores (due to Eliminate the synchronous wait from inside TearFree)" href="show_bug.cgi?id=70764">https://bugs.freedesktop.org/show_bug.cgi?id=70764</a> tracks that this hang is more likely with TearFree (fundamentally the hang is still the same hardware issue, but it is interesting that TearFree has a higher chance of hitting it). If you want to experiment: <a href="http://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=requests">http://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=requests</a> should have an interesting fix, at least for trying to prevent the TearFree leading to the semaphore hang.</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>