[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 #18 from Aaron Lu <aaron.lu at intel.com> ---
(In reply to jre.winesim from comment #16)
> My patch has been accepted by Rafael and subsequently merged to:
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ master
> 
>   commit 3120d03cf64d7f9fd71231827af2c1550aa4caa7
>   Author: Jens Reyer <jens.reyer at gmail.com>
>   Date:   Tue Feb 17 19:07:29 2015 +0100
>   ACPI / video: Disable native backlight on Samsung Series 9 laptops
> 
> Thanks Aaron Lu for guiding me through my first kernel patch submission.
> 
> So this bug will be fixed in Linux 3.20/4.0 and this report here may be
> closed.
> 
> Still I'd like to know if there are any plans to reenable native backlight,
> now that we know (thanks Luca Boccassi) that a newer
> xserver-xorg-video-intel also fixes the issues. Aaron?

I'm not sure how exactly the updated xserver-xorg-video-intel package fixed the
problem. The native backlight control interface is provided by the in kernel
i915 driver and shouldn't be possible to be fixed by an user space package. If
this remains true, I don't see there is a need to enable the native backlight
interface.

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