For Kubuntu 9.10 on R52 I can confirm that "echo enable,0x00ffffff | sudo tee /proc/acpi/ibm/hotkey" (and mask 0x00fdffff too) works for volume control but NOT for brightness. Brightness buttons works but, but no OSD and slider in PowerDevil does not.
For Kubuntu 9.10 on R52 I can confirm that "echo enable,0x00ffffff | sudo tee /proc/acpi/ ibm/hotkey" (and mask 0x00fdffff too) works for volume control but NOT for brightness. Brightness buttons works but, but no OSD and slider in PowerDevil does not.