The option accessed via "Setup" → "System" → "Dysplay" → "Brightness" on OpenArena has no effect.
Hardware here: Radeon HD 4870
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV770
OpenGL version string: 2.1 Mesa 8.0-devel
OpenGL shading language version string: 1.20
I am using xorg-edgers ppa.
*** This bug has been marked as a duplicate of bug 27222 ***