There is nothing PowerDevil can do about this. It should be fixed in the kernel.
As a workaround brightness_in_hardware can be set to true (hal-info package).
** Changed in: kdebase-workspace (Ubuntu)
Status: New => Fix Released
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Powerdevil brightness OSD does not display if
laptop_panel.brightness_in_hardware = true
https://bugs.launchpad.net/bugs/461524
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