[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

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #5 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to jre.winesim from comment #0)
> Brightness can only be regulated up to 5% while being at the GDM login
> prompt if an external HDMI monitor is connected.
> 
> It works again after logging in to Gnome.
> If the HDMI monitor is not connected it also works.

If you boot without HDMI, ensure backlight control works, then hotplug HDMI,
does the backlight control cease to work?

Vice versa, if you boot with HDMI, confirm the bug is present, then unplug HDMI
,does the problem go away?

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