[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 #13 from Luca Boccassi <luca.boccassi at gmail.com> ---
Hello,

I have a Dell Latitude E5540, running an Intel Haswell i7-4600U with GPU HD
Graphics 4400, and I have the same problem. But I noticed that upgrading the
Intel driver to a version that ships a new backlight helper binary fixes the
problem.

In my case, I am running Debian Jessie. The driver is part of the package
xserver-xorg-video-intel and the version that ships the new backlight helper,
according to the changelog, is:

xserver-xorg-video-intel (2:2.99.911+git20140529-1~exp1) experimental;
urgency=low

  * New upstream prerelease. (closes: #748753)
  * Install new backlight helper.

Kind regards,
Luca Boccassi

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