<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Kernel "NULL pointer dereference" with MST monitor on HSW" href="https://bugs.freedesktop.org/show_bug.cgi?id=97666#c5">Comment # 5</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - 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:elio.martinez.monroy@intel.com" title="Elio <elio.martinez.monroy@intel.com>"> Elio</a> <pre>Hello all, I was trying with different Kernels from: <a href="http://kernel.ubuntu.com/~kernel-ppa/mainline/">http://kernel.ubuntu.com/~kernel-ppa/mainline/</a> Including 4.7, 4.8.0 and 4.8rc8 The problem with 4.7 and beyond, before 4.8 seems to be CPU pipe A FIFO underrun For 4.8 and beyond, the error is a little bit more specific. Blaming the dp_link_training_clock. Hardware: Intel Nuc 6i5SYH In some cases i need an extra monitor because 4k monitor didn't come back from sleep I tried with different software configuration as well facing same behavior. Software configuration: Component : drm url : <a href="http://cgit.freedesktop.org/mesa/drm">http://cgit.freedesktop.org/mesa/drm</a> tag : libdrm-2.4.68 commit : fc09c5ab84240e9b6bd0bed01685ef004f56c4fa author : Kenneth Graunke <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>> age : 4 months ago Component : mesa url : <a href="http://cgit.freedesktop.org/mesa/mesa">http://cgit.freedesktop.org/mesa/mesa</a> tag : mesa-12.0.1 commit : 04277f058d00238937e664cf546c43b16cea7b2b author : Emil Velikov <<a href="mailto:emil.velikov@collabora.com">emil.velikov@collabora.com</a>> age : 8 weeks ago Component : xf86-video-intel url : <a href="http://cgit.freedesktop.org/xorg/driver/xf86-video-intel">http://cgit.freedesktop.org/xorg/driver/xf86-video-intel</a> tag : 2.99.917-701-g205146b commit : 205146b0fdc8db016e5cfeeae5a6b25df3470ebc author : Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Component : libva url : <a href="http://cgit.freedesktop.org/libva">http://cgit.freedesktop.org/libva</a> tag : libva-1.7.2.pre1 commit : 9927bd2fbbb1d923fd6a8932a3cdbb5c9185ee22 author : Xiang Haihao <<a href="mailto:haihao.xiang@intel.com">haihao.xiang@intel.com</a>> Component : intel-driver url : <a href="http://cgit.freedesktop.org/vaapi/intel-driver">http://cgit.freedesktop.org/vaapi/intel-driver</a> tag : 1.7.2.pre1 commit : ce444fb412966ca6afbb1331b7cae8ab621c1108 author : Xiang Haihao <<a href="mailto:haihao.xiang@intel.com">haihao.xiang@intel.com</a>> Component : cairo url : <a href="http://cgit.freedesktop.org/cairo">http://cgit.freedesktop.org/cairo</a> tag : 1.15.2 commit : db8a7f1697c49ae4942d2aa49eed52dd73dd9c7a author : Bryce Harrington <<a href="mailto:bryce@osg.samsung.com">bryce@osg.samsung.com</a>> Component : xserver url : <a href="http://cgit.freedesktop.org/xorg/xserver">http://cgit.freedesktop.org/xorg/xserver</a> tag : xorg-server-1.18.3 commit : 9454cd51da9b38b974cff7c8b7125901f6403848 author : Adam Jackson <<a href="mailto:ajax@redhat.com">ajax@redhat.com</a>> Component : macros url : <a href="https://cgit.freedesktop.org/xorg/util/macros">https://cgit.freedesktop.org/xorg/util/macros</a> tag : util-macros-1.19.0-2-gd7acec2 commit : d7acec2 author : Andreas Boll <<a href="mailto:andreas.boll.dev@gmail.com">andreas.boll.dev@gmail.com</a>> age : 8 months ago Component : intel-gpu-tools url : <a href="https://cgit.freedesktop.org/xorg/app/intel-gpu-tools">https://cgit.freedesktop.org/xorg/app/intel-gpu-tools</a> tag : intel-gpu-tools-1.16 commit : a28e9e38a9efc6daf5a08d60d29adcd3e328fe6f author : Marius Vlad <<a href="mailto:marius.c.vlad@intel.com">marius.c.vlad@intel.com</a>></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>