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2013-07-29 09:22:38 -0500 commented question F19 Macbook Air Brightness Issue after suspend

I've opened the following bug to hopefully move things along. Please comment if you experience the same issue: https://bugzilla.redhat.com/show_bug.cgi?id=989555

2013-07-29 09:21:38 -0500 commented answer F19 Macbook Air Brightness Issue after suspend

Accessing through /sys/devices/pci* (or any other location) doesn't work for me. I can't find a backlight control in that structure. I did try using my commands above in the systemd script location but while it sets the backlight, it still doesn't have an effect.

2013-07-21 21:22:55 -0500 asked a question F19 Macbook Air Brightness Issue after suspend

On a clean reboot, my brightness hotkeys and setting manually (e.g. su -c "echo 10 > /sys/class/backlight/intel_backlight/brightness") works fine. The brightness 'steps' increment smoothly from 0% to 100% brightness. However, after a suspend / restore, there are only two effective brightness steps - 0% or about 95%. Anything below 95% brightness and the screen turns off, and anything above that and it's about 95% brightness. The hotkeys still technically work and show the percentage correctly (and /sys/class/backlight/intel_backlight/brightness appears to show the correct value too), but the actual screen is either all on or all off.

mhicks@localhost ~$ cat /sys/class/backlight/intel_backlight/brightness 
2639
mhicks@localhost ~$ cat /sys/class/backlight/intel_backlight/max_brightness 
2777

I've tried setting acpi_backlight=vendor in my kernel command line which didn't work and I've tried the various rc.local scripts to set the brightness on boot and another script in /etc/pm/sleep.d/ to set the brightness on sleep but that didn't work as well.

Any ideas?

2013-07-21 21:06:33 -0500 answered a question F19 Macbook Air 2013 Touchpad Patch Issue

It's not incredibly detailed but I try and cover some of the basics around patching the kernel here - http://mattoncloud.org/2013/07/18/fedora-19-on-a-macbook-air-2013-model/.