[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 #8 from Jani Nikula <jani.nikula at intel.com> ---
Let's focus on *not* adding i915.invert_brightness=1. Is there a difference
between booting with the external monitor connected vs. disconnected and
hotplugged later?

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