<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [hsw backlight bisected] backlight is off after resume" href="https://bugs.freedesktop.org/show_bug.cgi?id=80773#c20">Comment # 20</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [hsw backlight bisected] backlight is off after resume" href="https://bugs.freedesktop.org/show_bug.cgi?id=80773">bug 80773</a> from <a class="email" href="mailto:odi@odi.ch" title="Ortwin Glück <odi@odi.ch>"> Ortwin Glück</a> <pre>Created <a href="attachment.cgi?id=108913" name="attach_108913" title="debug output">attachment 108913</a> <a href="attachment.cgi?id=108913&action=edit" title="debug output">[details]</a> debug output This is the debug output of a complete cycle: power-on/suspend/resume/power-off that demos the backlight problem. Excerpt: after resume backlight comes on quickly: [ 90.150434] [drm:intel_dp_complete_link_train] Channel EQ done. DP Training successful [ 90.150584] [drm:intel_edp_backlight_on] [ 90.150586] [drm:intel_panel_enable_backlight] pipe A [ 90.150591] [drm:intel_panel_actually_set_backlight] set backlight PWM = 2789 this is pm-utils writing 0, then 2789 to /sys/class/backlight/intel_backlight/brightness: [ 90.235459] [drm:intel_backlight_device_update_status] updating intel_backlight, brightness=2789/4648, bl_power=1, by pm-suspend [ 90.235468] [drm:intel_panel_actually_set_backlight] set backlight PWM = 2789 then something turns it off again: [ 90.235510] [drm:intel_edp_backlight_power] panel power control backlight disable</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>