[Bug 1142651] [NEW] Brightness does not change on TOSHIBA L870-18J with AMD RADEON HD 7670M

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The problem is that brightness is at full and I cannot change it. The Fn+F2, Fn+F3 keys do not do anything.
I have tried adding boot parameters like nomodeset, acpi_hardware=vendor etc. But nothing has worked for me.
I even tried the /sys/class/backlight way but there is a problem. This directory is empty.
I am using ubuntu 12.04.2 64bit and I have tried both open source and amd proprietary (13.1) drivers (even the  13.2 beta).
I even tried the latest mainline kernels up to 3.8.1 which also did not solve my problem.

** Affects: udev (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd bot-comment brightness radeon toshiba
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Brightness does not change on TOSHIBA L870-18J with AMD RADEON HD 7670M
https://bugs.launchpad.net/bugs/1142651
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