<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [eDP regression] blank screen on boot" href="https://bugs.freedesktop.org/show_bug.cgi?id=74628#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [eDP regression] blank screen on boot" href="https://bugs.freedesktop.org/show_bug.cgi?id=74628">bug 74628</a> from <a class="email" href="mailto:przanoni@gmail.com" title="Paulo Zanoni <przanoni@gmail.com>"> Paulo Zanoni</a> <pre>Created <a href="attachment.cgi?id=93568" name="attach_93568" title="Patch with debugging option">attachment 93568</a> <a href="attachment.cgi?id=93568&action=edit" title="Patch with debugging option">[details]</a> <a href='page.cgi?id=splinter.html&bug=74628&attachment=93568'>[review]</a> Patch with debugging option Hi This patch adds a Kernel command line option that will help us debug the problem. Please apply the patch, then try booting with: - i915.edp_delays=0 - i915.edp_delays=1 - i915.edp_delays=2 - i915.edp_delays=3 - i915.edp_delays=4 And please tell us which ones solve the bug for you. If you discover that i915.edp_delays=4 solves the problem for you, you could also try removing chunks of code that look for "i915.edp_delays == EDP_DELAYS_I915_OLD" until you get a minimal set of checks that are essential to get your Kernel working. But this could easily take you a few hours of debugging :) Thanks, Paulo</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>