<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light" href="https://bugs.freedesktop.org/show_bug.cgi?id=73156#c9">Comment # 9</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light" href="https://bugs.freedesktop.org/show_bug.cgi?id=73156">bug 73156</a> from <a class="email" href="mailto:daiver@daiver.ru" title="Daiver <daiver@daiver.ru>"> Daiver</a> <pre># ls /sys/class/backlight/ acpi_video0 intel_backlight /sys/class/backlight/acpi_video0 actual_brightness: 30 bl_power: 0 brightness: 30 max_brightness: 100 type: firmware "echo 40 > brightness" change brightness on eDP1 (internal LCD) /sys/class/backlight/intel_backlight actual_brightness: 1216 bl_power: 0 brightness: 1216 max_brightness: 4302 type: raw "echo 1632 > brightness" change brightness on eDP1 (internal LCD) 30 in acpi_video0 is 1216 in intel_backlight 40 in acpi_video0 is 1632 in intel_backlight change in acpi_video0 will change intel_backlight change in intel_backlight will NOT change value in acpi_video0 through this interfaces i can change brightness only on eDP1 (internal LCD) there is no interfaces to control on DP1 (external LCD)</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>