Cannot control brightness settings on Dell XPS L502X - Slackware 13.37
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Works for my Dell with a fresh install. It seems you are getting close.
Structure on my laptop, notice the other links;
What do you see in 'brightness'? Just cat brightness, do the Fn up/Down then 'cat brightness' to see if it changes.
I am wondering what you see in '/var/log/Xorg.0.log'?
I ran ls -al, and that's the output:
bash-4.1# ls -al
drwxr-xr-x 3 root root 0 Jan 3 17:44 .
drwxr-xr-x 3 root root 0 Jan 3 17:44 ..
-r--r--r-- 1 root root 4096 Jan 3 17:45 actual_brightness
-rw-r--r-- 1 root root 4096 Jan 3 17:52 bl_power
-rw-r--r-- 1 root root 4096 Jan 3 17:52 brightness
lrwxrwxrwx 1 root root 0 Jan 3 17:44 device -> ../../../LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:01/device:35
-r--r--r-- 1 root root 4096 Jan 3 17:44 max_brightness
drwxr-xr-x 2 root root 0 Jan 3 17:52 power
lrwxrwxrwx 1 root root 0 Jan 3 17:44 subsystem -> ../../../../class/backlight
-rw-r--r-- 1 root root 4096 Jan 3 17:44 uevent
I ran 'cat brightness', did the Fn up/Down then 'cat brightness', but it didn't change.
About '/var/log/Xorg.0.log', it's a huge file. Should I paste it here?