Comment 4 for bug 922037

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Herton R. Krzesinski (herton) wrote : Re: "reduce brightness" key freezes system

Andreas, can you try booting with intel_iommu=off kernel parameter? I think you hit another issue in 3.2, or try the newer 3.2.2 build from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.2.2-precise/, which should have intel_iommu disabled by default.