<div class="gmail_quote">On Wed, Nov 16, 2011 at 15:24, Andrew Lutomirski <<a href="mailto:luto@mit.edu">luto@mit.edu</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> AFAICT my snb laptop has always been stable with semaphores and VT-d enabled. Is this problem possibly restricted to just desktop machines? I'm happy to test, since my box that can reproduce the hang instantly is still around. </blockquote><div> I cannot reproduce those issues on any mobile SNB, but I am out of desktop ones. So perhaps it is a clue. Jesse, Keith, Daniel, what if we add something like: ... .has_semaphores=1, .has_rc6=1 ... to i915_drv.c intel_sandybridge_m_info, and take them into account when using default values for those settings? </div></div> -- Eugeni Dodonov<a href="http://eugeni.dodonov.net/" target="_blank"> </a>