[quote]The backlight works WITHOUT the poulsbo driver.

well "works" with a script to manage brightness as my function keys do
not always work, even with the kernel options "acpi_backlight=vendor and
acpi_osi=Linux".[/quote]

How does this work exactly?

I have precise beta and kernel 3.2.0-23-generic-pae on a Vaio P and using 
psb_gfx and lxde.
When I press the bright/dim hot keys lxde (or openbox? x?) recognizes it and 
displays a little popup showing a brightness change indicator, but the 
brightness does not actually change.

This worked fine on oneiric using emgd 1.8 on the same machine a few
weeks ago up until I upgraded to precise beta and switched to psb_gfx.

If psb_gfx has backlight support, how do I use it?

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https://bugs.launchpad.net/bugs/899244

Title:
  GMA500 psb_gfx

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