[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 #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
Can you please "ls /sys/class/backlight/" and play with the knobs in there
(e.g. cat /sys/class/backlight/acpi_backlight0/max_brightness >
/sys/class/backlight/acpi_backlight0/brightness"?

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