<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [i915 intel_backlight] can't regulate brightness at GDM login prompt if HDMI monitor connected" href="https://bugs.freedesktop.org/show_bug.cgi?id=87286#c19">Comment # 19</a> on <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [i915 intel_backlight] can't regulate brightness at GDM login prompt if HDMI monitor connected" href="https://bugs.freedesktop.org/show_bug.cgi?id=87286">bug 87286</a> from <a class="email" href="mailto:luca.boccassi@gmail.com" title="Luca Boccassi <luca.boccassi@gmail.com>"> Luca Boccassi</a> <pre>(In reply to Aaron Lu from <a href="show_bug.cgi?id=87286#c18">comment #18</a>) > (In reply to jre.winesim from <a href="show_bug.cgi?id=87286#c16">comment #16</a>) > > 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 <<a href="mailto:jens.reyer@gmail.com">jens.reyer@gmail.com</a>> > > 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. Hello Aaron, That package ships a binary, xf86-video-intel-backlight-helper, which apparently is used to regulate the brightness. I'm not familiar with the code myself or the project itself, but with a quick Google search this Xorg mailer thread came up and it does shed some light on how this is used: <a href="http://lists.x.org/archives/xorg-devel/2014-February/040575.html">http://lists.x.org/archives/xorg-devel/2014-February/040575.html</a> Kind regards, Luca Boccassi</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>