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I'm working with a Sony Vaio BZ-12 Notebook and want to know how to manage the brightness of my display, especially when it's in eco-mode.

The designated Graphic-Accelerator is the Intel GM45. With the 10.04 release I could control the brightness with the Fn keys, but not all the time.

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This isn't likely to be related to the Intel display adapter, but rather to detection of the Fn keys or Vaio-specific hardware drivers. Test whether the brightness slider in System ▸ Preferences ▸ Power Management works, and use one of the methods described on this page to find out whether a keycode is being generated when you press the Fn keys. – ændrük Feb 1 '11 at 19:29
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As ændrük said, this is probably not actually related to the intel driver, but if you want to adjust the backlight manually, you can set it via the command line using sysfs.

cat /sys/class/backlight/[whatever driver, usually there is only 1 just just tab complete this]/max_brightness

To see what the max is, then

echo [whatever brightness] | sudo tee - /sys/class/backlight/[same driver]/brightness
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