Verified with 3.16.0-031600-generic #201408031935 This issue does not exist with this kernel.
Also, brightness control could work with the "video.use_native_backlight=1" kernel parameter on 3.13 kernel.
Verified with 3.16.0- 031600- generic #201408031935
This issue does not exist with this kernel.
Also, brightness control could work with the "video. use_native_ backlight= 1" kernel parameter on 3.13 kernel.