Comment 2 for bug 1255428

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N1ck 7h0m4d4k15 (nicktux) wrote : Re: LCD brightness control keys and widget do not work on Intel Graphics on Saucy

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:

apport-collect 1255428

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

This is a known problem. Please see here on how to debugging blacklight:
https://wiki.ubuntu.com/Kernel/Debugging/Backlight

Your slider works for me also :-)

Here is a thread on ubuntuforums.org . See another workaround related to ACPI events.
http://ubuntuforums.org/showthread.php?t=2156192&p=12701188#post12701188

Best Regards
    NikTh