I'm running Ubuntu 11.04 on a Lenovo ThinkPad W510 (Nvidia Quadro FX 880M 
graphics card).
- setpci does nothing
- using /proc/acpi tables to adjust display brightness doesn't work
- Using /sys/class/backlight/... also doesn't work
All of the above still aren't working if I pass the acpi_backlight=vendor 
kernel option in grub. All this does is locking the brightness to max.

If I kill X and work on the CLI, the brightness setting DOES work! It's
only under gnome that I cannot adjust the brightness.

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https://bugs.launchpad.net/bugs/538256

Title:
  Screen brightness not controllable on Lenovo Ideapad S10-3, U350, and
  Z360

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