[Bug 516772] Re: HP Touchsmart tm2 brightness level not changing

[Robert Hooker]

It working with setpci implies that you need a native backlight
interface which unfortunately does not exist in i915 under KMS at the
moment. There is discussion on exposing a native backlight interface so
XRANDR can control such devices upstream but the details haven't been
worked out and it probably wont go in until the 2.6.35 timeframe.

 https://patchwork.kernel.org/patch/81187/

Is there a platform driver that can drive your backlight? hp-wmi doesn't
support it?

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HP Touchsmart tm2 brightness level not changing
https://bugs.launchpad.net/bugs/516772
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