I have same problem here with my Samsung R70 Aura
I have tested following things
1. In a xterm:
[EMAIL PROTECTED]:/proc/acpi/video/NVID/LCD # cat brightness
levels: 10 30 40 50 60 70 80 100
current: 100
2. After this 2 times „FN+Arrow down“ -> no visible changes to lcd-brightness
Again in xterm:
[EMAIL PROTECTED]:/proc/acpi/video/NVID/LCD # cat brightness
levels: 10 30 40 50 60 70 80 100
current: 70
3. Changed to console
4.1.1 Press "FN+arrow down" again -> LCD becomes very dark about 60% of before.
4.1.2 Control the brightness in console
[EMAIL PROTECTED]:/proc/acpi/video/NVID/LCD # cat brightness
levels: 10 30 40 50 60 70 80 100
current: 60
4.1.3 Change back to X-Server brigthness although changed to 60%
Repeat steps 1-3:
4.2.1 Press "FN+arrow up" -> LCD becomes a bit darker about 80% of before.
4.2.2 Control the brightness in console
[EMAIL PROTECTED]:/proc/acpi/video/NVID/LCD # cat brightness
levels: 10 30 40 50 60 70 80 100
current: 80
4.2.3 Change back to X-Server brigthness although changed to 80%
As a conclusion it seems that the FN-keys doing everything right but
x-server or card-driver ("nvidia") are not reacting correctly to the
values inside /proc/acpi/video/NVID/LCD/brightness
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backlight brighness control does not work (Samsung Q45 with Nvidia GForce 8400M)
https://bugs.launchpad.net/bugs/146710
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