<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Kernel "NULL pointer dereference" with MST monitor on HSW" href="https://bugs.freedesktop.org/show_bug.cgi?id=97666#c24">Comment # 24</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - Kernel "NULL pointer dereference" with MST monitor on HSW" href="https://bugs.freedesktop.org/show_bug.cgi?id=97666">bug 97666</a> from <a class="email" href="mailto:carlos.santa@intel.com" title="Carlos Santa <carlos.santa@intel.com>"> Carlos Santa</a> <pre>To make the bisect more simpler I moved the bisection to the drm-intel tree instead of the Ubuntu one. Using the following two commits as starting point for the bisect: Bad commit: a4fce9cb782ad340ee5576a38e934e5e75832dc6 Good commit: 14740bb25ec36fe4ce8042af3eb48aeb45e5bc13 the commit that introduced the null pointer seems to be this one: 27d4efc5591a5853de54713bc717de73c8951e17 is the first bad commit commit 27d4efc5591a5853de54713bc717de73c8951e17 Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>> Date: Mon Oct 3 10:55:15 2016 +0300 drm/i915: Move long hpd handling into the hotplug work We can't rely on connector->status in the detect() hook if the long hpd was already handled by the dig_port_work as that won't update connector->status. Thus we have to defer the long hpd handling entirely until the hotplug work runs to avoid the double long hpd handling the "detect_done" flag is trying to prevent. We'll start to depend on connector->status being up to date in a following patch. Cc: Damien Cassou <<a href="mailto:damien@cassou.me">damien@cassou.me</a>> Cc: <a href="mailto:freedesktop.org@gp.mailgun.org">freedesktop.org@gp.mailgun.org</a> Cc: Arno <<a href="mailto:blouin.arno@gmail.com">blouin.arno@gmail.com</a>> Cc: Shubhangi Shrivastava <<a href="mailto:shubhangi.shrivastava@intel.com">shubhangi.shrivastava@intel.com</a>> Cc: Sivakumar Thulasimani <<a href="mailto:sivakumar.thulasimani@intel.com">sivakumar.thulasimani@intel.com</a>> Cc: Ander Conselvan de Oliveira <<a href="mailto:conselvan2@gmail.com">conselvan2@gmail.com</a>> Cc: <a href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a> Tested-by: Arno <<a href="mailto:blouin.arno@gmail.com">blouin.arno@gmail.com</a>> Bugzilla: <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [ivb] No beamer on VGA [active DP-to-VGA convertor]" href="show_bug.cgi?id=83348">https://bugs.freedesktop.org/show_bug.cgi?id=83348</a> Signed-off-by: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>> Link: <a href="http://patchwork.freedesktop.org/patch/msgid/1475481316-8194-1-git-send-email-ville.syrjala@linux.intel.com">http://patchwork.freedesktop.org/patch/msgid/1475481316-8194-1-git-send-email-ville.syrjala@linux.intel.com</a> Reviewed-by: Ander Conselvan de Oliveira <<a href="mailto:conselvan2@gmail.com">conselvan2@gmail.com</a>> which makes sense since there are changes related to display port. I'll continue tomorrow looking into the changes.</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>