[Bug 73156] Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73156

--- Comment #9 from Daiver <daiver at daiver.ru> ---
# 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)

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