<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [BSW] eDP screen is blank when booting with DP display connected" href="https://bugs.freedesktop.org/show_bug.cgi?id=87223#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [BSW] eDP screen is blank when booting with DP display connected" href="https://bugs.freedesktop.org/show_bug.cgi?id=87223">bug 87223</a> from <a class="email" href="mailto:jeff.zheng@intel.com" title="Jeff Zheng <jeff.zheng@intel.com>"> Jeff Zheng</a> <pre>I tried 10-17 nightly kernel that was tested fine before, but I saw both DP and eDP screen are blank. So it seems that this issue might be related with BIOS version. I tried to downgrade the BIOS from 0.49 to 0.40, and found that both DP and eDP screen shows text for 10-17 nightly kernel. I tried other kernel and below is the result: BIOS 10-17 nightly 3.18.0 drm-intel-testing 12-06 0.49 both blank both blank eDP shows text, DP blank 0.40 Both show text both show text DP shows text, eDP blank I then run "testdisplay -a" for 3.18.0 + 0.40 BIOS, but DP screen is blank with two level 3 errors (many entried for each error): <3>[ 187.580558] [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up <3>[ 187.580932] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting Is it a BIOS issue?</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> <li>You are the assignee for the bug.</li> </ul> </body> </html>