Comment 32 for bug 992720

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Dave Cunningham (sparkprime) wrote :

This bug is a duplicate of https://bugs.launchpad.net/ubuntu/+source/linux/+bug/776999

I can confirm the following workaround allows full brightness control:

nox2apic kernel param

AND

In Device section of xorg.conf:

Option "RegistryDwords" "EnableBrightnessControl=1"