[Bug 87286] [i915 intel_backlight] can't regulate brightness at GDM login prompt if HDMI monitor connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87286

--- Comment #10 from jre.winesim at gmail.com ---
This is still in 3.18.6.

A friend of mine has a laptop from the same product family SAMSUNG
900X3C/900X3D/900X3E/900X4C/900X4D running Debian Wheezy (contrary to my Debian
Jessie) without an external monitor connected (I have one connected on HDMI):
There with all kernel >3.14 (from Debian backports) the GDM login screen is
black and brightness not adjustable at all until she logs in. Disabling
intel_backlight also fixes the problem there.

So my proposed patch would help both of us.

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