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

[kogias marios]

I also noticed that the window "System Settings" -->  "Brightness and
Lock" does not contain any brightness controls.

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Title:
  Brightness does not change on TOSHIBA L870-18J with AMD RADEON HD
  7670M

Status in “udev” package in Ubuntu:
  New

Bug description:
  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.

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