<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - rc6 causes system hang once a few days ending with corrupted screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=60437#c10">Comment # 10</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - rc6 causes system hang once a few days ending with corrupted screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=60437">bug 60437</a> from <a class="email" href="mailto:ben@bwidawsk.net" title="Ben Widawsky <ben@bwidawsk.net>"> Ben Widawsky</a> <pre>(In reply to <a href="show_bug.cgi?id=60437#c9">comment #9</a>) > Applied this patch to 3.8rc6, crashed again. > > A very looong shot, but is there any way to bump RC6 voltage to more than > 450mV? Yes sure. First you can verify the setting was correct with cat /sys/kernel/debug/dri/0/i915_drpc_info Since we're entering into unsafe territory, I'll attach this is a patch, but inline. Up to you to try it... diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 82b68fe..9126b7f 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -2664,6 +2664,10 @@ static void gen6_enable_rps(struct drm_device *dev) DRM_ERROR("Couldn't fix incorrect rc6 voltage\n"); } +#define RC6_VOLTAGE 500 + rc6vids &= 0xffff00; + rc6vids |= GEN6_ENCODE_RC6_VID(RC6_VOLTAGE); + BUG_ON(sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_RC6VIDS, rc6vids)); gen6_gt_force_wake_put(dev_priv); }</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>