Hello, I have a problem with my Samsung notebook.
My Function Keys (Fn) that manage the brightness level are bios-controlled,
because they work before Linux boot (in grub and in bios for example).
The problem is that they don't work after the boot. The only way to change the
screen brightness is doing echo n>/proc/acpi/video/GFX0/DD03/brightness (where
n is the desired brightness level).
I can't assign any function to the brightness fn keys (I think that's because
they're bios controlled).
I tried 4 keystrokes doesn`t return keycodes. They`re FN+F7 FN+F8 FN+F9 FN+F10
I did dmesg|tail -5 command and it returns this below.
[ 80.440431] ata4.00: status: { DRDY ERR }
[ 133.093263] ACPI: Please implement acpi_video_bus_ROM_seq_show
[ 133.250579] ACPI: Please implement acpi_video_bus_ROM_seq_show
[ 134.123082] ACPI: Please implement acpi_video_bus_ROM_seq_show
[ 1333.281087] CE: hpet increasing min_delta_ns to 15000 nsec
when cat '/proc/acpi/video/GFX0/DD03/brightness it returns some values.
levels: 13 25 38 50 63 75 88 100
current: 63
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ACPI video brightness not working(F7 F8)
https://bugs.launchpad.net/bugs/545731
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