<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - LVDS blank screen on GM45" href="https://bugs.freedesktop.org/show_bug.cgi?id=94825#c31">Comment # 31</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - LVDS blank screen on GM45" href="https://bugs.freedesktop.org/show_bug.cgi?id=94825">bug 94825</a> from <a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> Ville Syrjala</a> <pre>(In reply to Rob Kramer from <a href="show_bug.cgi?id=94825#c30">comment #30</a>) > Created <a href="attachment.cgi?id=126271" name="attach_126271" title="dmesg with override bit patch">attachment 126271</a> <a href="attachment.cgi?id=126271&action=edit" title="dmesg with override bit patch">[details]</a> > dmesg with override bit patch > > I've added a dmesg dump of kernel 4.7.2 with two of your patches > (backported): > > drm/i915: Debug GBDA get panel details > drm/i915: Ignore OpRegion panel type unless the "override" bit is set > > The result is that my screen doesn't switch on anymore. I've tested with > vanilla 4.7.2 as well, and that works OK. > > Is the output OK for you? If you want me to test further patches, no problem. [ 4.988023] [drm:swsci] GBDA get panel details 0x00000020 0x00021000 [ 4.988026] [drm:intel_opregion_get_panel_type] No OpRegion panel type override Argh. So the override bit won't help us :( I have no good ideas how to make this truly automagic, so I think we need a quirk of some sort for your machine. Can you provide the output of 'lspci -vnn -s 0:2.0' and 'dmidecode' ?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>