Comment 67 for bug 357673

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Crispin Flowerday (crispin-flowerday-deactivatedaccount) wrote : Re: No notification when sliding audio volume, muting volume, sliding LCD brightness on X31, X32, T60, R50e, T42, R52

As I have said before on this bug, g-p-m does handle brightness correctly assuming that hal is setup to know that your panel handles things in hardware. you need the following property on the panel:

  laptop_panel.brightness_in_hardware = true

g-p-m has handled this properly for around 3 years. Please revert the brightness change and get the correct flags in hal.