Comment 30 for bug 176888

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Michael Doube (michael-doube) wrote : Re: [Bug 176888] Re: Backlight dimming not working in Hardy or Intrepid because of wrong XRandR BACKLIGHT_CONTROL setting

Mostafa:

Check the output of:
]$ lspci

What graphics card is listed? If you are running in SPEED mode it will
probably be an nVidia card and you should look here for help:
https://bugs.launchpad.net/bugs/95444

Mike