*** This bug is a duplicate of bug 1163720 ***
https://bugs.launchpad.net/bugs/1163720
Look like the same problem affected me. After rebooting after automatic upgrade
to new 3.2.0-43-generic kernel, backlight get to 100% of brightness. Fn keys
change brightness indicator only, not actual brightness. File
/sys/class/backlight/intel_backlight/brightness unaccessible even with root
privileges. The value in the files are:
actual_brightness 4882
bl_power 382089960
brightness 0
max_brightness 4882
type raw
uevent is empty.
It looks, like it should be reported here, because it's about 12.04 LTS
and is not under attention in https://bugs.launchpad.net/bugs/1163720.
--------------------------------
db@NODE:/sys/class/backlight/intel_backlight$ ls -alF
total 0
drwxr-xr-x 3 root root 0 мая 22 17:06 ./
drwxr-xr-x 4 root root 0 мая 22 17:06 ../
-r--r--r-- 1 root root 4096 мая 22 17:06 actual_brightness
-rw-r--r-- 1 root root 4096 мая 22 17:54 bl_power
-rw-r--r-- 1 root root 4096 мая 22 17:06 brightness
lrwxrwxrwx 1 root root 0 мая 22 17:54 device -> ../../card0-LVDS-1/
-r--r--r-- 1 root root 4096 мая 22 17:54 max_brightness
drwxr-xr-x 2 root root 0 мая 22 17:54 power/
lrwxrwxrwx 1 root root 0 мая 22 17:06 subsystem ->
../../../../../../../class/backlight/
-r--r--r-- 1 root root 4096 мая 22 17:54 type
-rw-r--r-- 1 root root 4096 мая 22 17:06 uevent
db@NODE:/sys/class/backlight/intel_backlight$ sudo echo 0 >
/sys/class/backlight/intel_backlight/brightness
bash: /sys/class/backlight/intel_backlight/brightness: Permission denied
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https://bugs.launchpad.net/bugs/1166495
Title:
Brightness fn keys don't work on dell xps 13 ultrabook
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