<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)" href="https://bugs.freedesktop.org/show_bug.cgi?id=54226#c27">Comment # 27</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [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:mikhail.v.gavrilov@gmail.com" title="mikhail.v.gavrilov@gmail.com">mikhail.v.gavrilov@gmail.com</a> <pre>(In reply to <a href="show_bug.cgi?id=54226#c24">comment #24</a>) > Mikhail, for the time being you can set i915.semaphores=0 (or echo 0 > > /sys/modules/i915/parameters/semaphores) to prevent this hang. What are the consequences? > The only interesting patch I can suggest atm is > > commit 31643d54a739382626c27c0f2a12b3bbc22d1a38 > Author: Ben Widawsky <<a href="mailto:ben@bwidawsk.net">ben@bwidawsk.net</a>> > Date: Wed Sep 26 10:34:01 2012 -0700 > > drm/i915: Workaround to bump rc6 voltage to 450 > > BIOS should be setting the minimum voltage for rc6 to be 450mV. Old or > buggy BIOSen may not be doing this, so we correct it for them. Ideally > customers should update the BIOS as only it would know the optimal > values for the platform, so we leave that fact as a DRM_ERROR for the > user to see. > > in 3.8-rc1 or look for a BIOS update. I have H61M/U3S3 motherboard and you latest BIOS ver 2.20 from 8/15/2012 <a href="ftp://174.142.97.10/bios/1155/H61MU3S3(2.20)ROM.zip">ftp://174.142.97.10/bios/1155/H61MU3S3(2.20)ROM.zip</a> How to check problem persists or not?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>