My Macbook Air 2013 power lasts 1.5 hours with just too bright light. More than 7 hours with normal light (that is 30-40% of the current max) corresponding to my default brightness in OS X where the battery lasts 7-9 hours.
I would like to have a one-liner of
gsettings to make the change.
There is a rapid jump in power consumption of display depending on the setting. I would like to find the optimum one for power consumption and usability.
Feature request https://bugs.freedesktop.org/show_bug.cgi?id=67454, pointed out here https://wiki.debian.org/InstallingDebianOn/Apple/MacBookAir/6-2. No upstread fix uploaded yet. It is not a bug but there is missing completely non-i915 backlight control, it is ranked medium majority importance but it is decided as notourbug. Possible change of hardware soon.
Any workarounds about the backlight?
git clone https://github.com/patjak/mba6x_bl Cloning into 'mba6x_bl'... remote: Counting objects: 140, done. remote: Total 140 (delta 0), reused 0 (delta 0), pack-reused 140 Receiving objects: 100% (140/140), 45.12 KiB | 0 bytes/s, done. Resolving deltas: 100% (76/76), done. Checking connectivity... done. masi@masi:~/jacob$ cd mba6x_bl/ masi@masi:~/jacob/mba6x_bl$ make make -C /lib/modules/4.4.0-22-generic/build M=/home/masi/jacob/mba6x_bl modules make: Entering directory '/usr/src/linux-headers-4.4.0-22-generic' CC [M] /home/masi/jacob/mba6x_bl/mba6x_bl.o Building modules, stage 2. MODPOST 1 modules CC /home/masi/jacob/mba6x_bl/mba6x_bl.mod.o LD [M] /home/masi/jacob/mba6x_bl/mba6x_bl.ko make: Leaving directory '/usr/src/linux-headers-4.4.0-22-generic' masi@masi:~/jacob/mba6x_bl$ sudo make install make -C /lib/modules/4.4.0-22-generic/build M=/home/masi/jacob/mba6x_bl modules_install make: Entering directory '/usr/src/linux-headers-4.4.0-22-generic' INSTALL /home/masi/jacob/mba6x_bl/mba6x_bl.ko At main.c:222: - SSL error:02001002:system library:fopen:No such file or directory: bss_file.c:175 - SSL error:2006D080:BIO routines:BIO_new_file:no such file: bss_file.c:178 sign-file: certs/signing_key.pem: No such file or directory DEPMOD 4.4.0-22-generic make: Leaving directory '/usr/src/linux-headers-4.4.0-22-generic'
where the errors are harmless. The result works in my system! Here is a ticket about the case.
Laptop: Macbook Air 2013-mid (6.2)
Ubuntu versions: 16.04
Linux kernel: 4.4 and 4.6
Status: deprecated feature request (RESOLVED NOTOURBUG) because no resources for the development for the adjustment of Apple Hardware for Linux at least on the Intel side. However, Patrik Jacobsen is working with it.