[Bug 83459] [hsw] Dual display Lenovo IdeaPad y510p requires i915.invert_brightness=1 to not dim screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83459

--- Comment #5 from Piotr Król <pietrushnic at gmail.com> ---
I have new observation, beacuse I'm using dual monitor setup (laptop + samsung
over hdmi) I didn't realize that disconnecting HDMI and booting with
i915.invert_brightness=1 cause laptop screen is black and I cannot increase
brightness or switch to tty console. After removing i915 parameter y510p boots
with normal scree brightness.

So it is definitely related with dual monitor configuration.

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