Many multimedia keys doesn't work in KDE 4 - The key you just pressed isn't supported by Qt

[unggnu]

When trying to assign the brightness keys to a keyboard shortcut the message: "The key you just pressed isn't supported by Qt" is displayed. I guess this is more of a Qt (both 4.4 and 4.5rc) problem, however it occurs in the KDE control center.

Since in Jaunty the /etc/acpi/sonybright.sh is removed I can't change the backlight of my laptop with Kubuntu but in Ubuntu because later one supports my keys out of the box in guidance-power-manager. Changing the brightness in the KDE power plasmoid works fine so it is only a key problem.

xev definitely shows my keys as supported:
KeyRelease event, serial 35, synthetic NO, window 0x3000001,
    root 0xab, subw 0x0, time 999639, (-629,210), root:(458,235),
    state 0x0, keycode 232 (keysym 0x1008ff03, XF86MonBrightnessDown),
same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyPress event, serial 35, synthetic NO, window 0x3000001,
    root 0xab, subw 0x0, time 1000020, (-629,210), root:(458,235),
    state 0x0, keycode 233 (keysym 0x1008ff02, XF86MonBrightnessUp),
same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

[unggnu (unggnu)]

The brightness keys have keycodes according to xev but they can't be used as a shortcut because of https://bugs.kde.org/show_bug.cgi?id=185453 .

[unggnu (unggnu)]

KeyRelease event, serial 35, synthetic NO, window 0x3000001,
    root 0xab, subw 0x0, time 999639, (-629,210), root:(458,235),
    state 0x0, keycode 232 (keysym 0x1008ff03, XF86MonBrightnessDown), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyPress event, serial 35, synthetic NO, window 0x3000001,
    root 0xab, subw 0x0, time 1000020, (-629,210), root:(458,235),
    state 0x0, keycode 233 (keysym 0x1008ff02, XF86MonBrightnessUp), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

[Jonathan Thomas (echidnaman)]

This is a Qt bug, since Qt is the one handling the keys.

[unggnu (unggnu)]

QT upstream bug report: http://www.qtsoftware.com/developer/task-tracker/index_html?method=entry&id=230168

I am not able to register it in Launchpad as an upstream bug report.