When in 11.10 nvidia proprietary drivers were enabled, disabled nvidia
drivers and display looked blurry, then changed display adapter drivers
to post version nvidia proprietary and rebooted... now the brightness
changes sometimes... using the f1 and f2 keys shows the brightness bar
changing, but the brightness only changes sometimes (viewing the desktop
initially upon startup, but not when running applications such as
firefox/chrome)

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https://bugs.launchpad.net/bugs/949088

Title:
  11.10 to 12.04 alpha on Macbook Pro

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