Comment 6 for bug 1332437

Yes, brightness control with fglrx could work with the latest daily-live kernel
Also, it works with fglrx removed (running the Intel GPU)

ubuntu@201401-14542:~$ uname -a
Linux 201401-14542 3.16.0-999-generic #201406200205 SMP Fri Jun 20 06:06:05 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

If it's a duplicated bug, please feel free to change the bug status.
Thanks