MacBook brightness cannot be changed in KDE (works in GNOME)

There is the same exact bug also on a Dell Inspiron 6400. Function keys for brightness do function in Gnome but not KDE.

My Dell Inspiron 6400 is working perfectly here, so I have no idea what's wrong with the previous person's laptop.

Out of curiosity though - which video card are you using?

Thanks for your report. Can you provide the following data:

1. Exact HW
cat /var/lib/acpi-support/system-product-name

2. Does these two command (if run from Konsole) change brightness properly on your laptop?

dcop `dcop | grep power-manager` power-manager brightnessUp

dcop `dcop | grep power-manager` power-manager brightnessDown

3. Does your laptop return same keycodes from brightness up (212) and down (101) as documented on
https://wiki.ubuntu.com/KubuntuLaptopKeycodes page? If not, what does it report and what does "lshal -m" report when key is pressed?

martin@blackbook:~/processing/miniprojects/desktop-effects-kde$ cat /var/lib/acpi-support/system-product-name
MacBook2,1

dcop calls change brightness just fine.

Key Events:

KeyPress event, serial 32, synthetic NO, window 0x4200001,
    root 0x59, subw 0x0, time 4250875430, (420,433), root:(640,648),
    state 0x0, keycode 101 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyRelease event, serial 32, synthetic NO, window 0x4200001,
    root 0x59, subw 0x0, time 4250875542, (420,433), root:(640,648),
    state 0x0, keycode 101 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyPress event, serial 32, synthetic NO, window 0x4200001,
    root 0x59, subw 0x0, time 4250875910, (420,433), root:(640,648),
    state 0x0, keycode 212 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyRelease event, serial 32, synthetic NO, window 0x4200001,
    root 0x59, subw 0x0, time 4250875910, (420,433), root:(640,648),
    state 0x0, keycode 212 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False

Which seems okay.

lshal -m:
23:40:45.265: usb_device_5ac_21b_noserial_if0_logicaldev_input condition ButtonPressed = brightness-down
23:40:45.929: usb_device_5ac_21b_noserial_if0_logicaldev_input condition ButtonPressed = brightness-up

Thanks for testing and reporting back. I will mark this bug as duplicate of bug 145337 which has multiple users reporting same problem.

I think I have the same problem, brightness etc. works in Unity but not in KDE4.9 (and 4.8.4). What can I do with it?

I have macbook Air 2012.