** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New = Confirmed
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kernel backlight control method missing for macbooks
https://bugs.launchpad.net/bugs/417770
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Hi rydberg,
Thanks for including the attached files. Could you also include your
/var/log/Xorg.0.log (or Xorg.0.log.old) from after reproducing the issue?
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I should make more clear that this issue is about the kernel backlight
control method only. The native method works fine (at least after adding
the nomodeset boot parameter). Thus, this issue should really just be
about that single line in the first comment. Attaching the failing xorg
log here
Hi rydberg,
Please attach the output of `lspci -vvnn`, and attach your /var/log/Xorg.0.log
(and maybe Xorg.0.log.old) file from after reproducing this issue. If you've
made any customizations to your /etc/X11/xorg.conf please attach that as well.
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Bryce, thank you for your reply. The issue behind the solution patch is
that when setting the xrandr BACKLIGHT_CONTROL property to 'kernel' to
use the sysfs interface to control the LCD backlight, the existing sysfs
backlight interface is not detected. The MacBookAir, as well as many
other
