<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [SNB rc6] drop MMIO writes leading to GPU hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=50619#c31">Comment # 31</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [SNB rc6] drop MMIO writes leading to GPU hang" href="https://bugs.freedesktop.org/show_bug.cgi?id=50619">bug 50619</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>That sounds similar to: 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. The people we asked to test that patch continued to report issues afterwards, so maybe we need to boost that value a little more, or maybe we didn't have the same root cause. What would be useful would a debugfs entry for us to see what values were changed in the BIOS.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>