Hello!
so I recently installed Debian Jessie on my MacBook. There are a few quirks of course, but over all the experience has been very positive.
I'm having issues with my screen brightness. After (re)booting, it works fine, I can adjust it with the brightness keys.
However, after suspending or hibernating (not exactly sure which), the brightness is either completely up r completely dark.
I went into /sys/class/backlight/intel_backlight and tried echoing values into "brightness":
Using 2228 or higher seems to give full brightness.
Using 2227 yields a wierd blinking effect.
Using 2226 also yields the blinking effect, but a lot darker.
Finally, 2225 and lower gives complete darkness.
So, this behavior happens after either supsending or hibernating.
If I call "systemctl suspend" and then immediately hit a key, the computer wakes up either immediately (in which case the problem does not appear), or it takes a while to wake up (I also hear a faint clicking sound coming from the laptop), and the problem appears, then won't go away until I reboot.
EDIT: I tried upgraded to kernel version 4.6 from jessie-backports, problem still exists there
EDIT: Seems people experience it on RedHat as well: https://bugzilla.redhat.com/show_bug.cgi?id=989555
EDIT: The proposed solution appears to work. https://github.com/patjak/mba6x_bl
Now the brightess keys don't work anymore, they try to adjust the intel_backlight settings (which don't do anything. ).
Progess...
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