Am 07.07.2014 19:58, schrieb Rafael Coutinho: > I have a v4l2 video capture board that using kernel 2.6 with v4l2 > em28xx driver 3.0.36 allows me to control brightness, contrast etc... > However in kernel 3.2 with v4l2 em28xx driver version 3.2.0 it does not. > > This is what I get from the latest driver: > root@android:/ # v4l2-ctl --info > Driver Info (not using libv4l2): > Driver name : em28xx > Card type : EM2860/SAA711X Reference Design > Bus info : usb-musb-hdrc.1-1 > Driver version: 3.2.0 > Capabilities : 0x05020051 > Video Capture > VBI Capture > Sliced VBI Capture > Audio > Read/Write > Streaming > root@android:/ # v4l2-ctl -d 0 -l > volume (int) : min=0 max=31 step=1 > default=31 value=31 flags=slider > mute (bool) : default=1 value=1 > > > What could be wrong? Before kernel 3.10, the brightness (contrast, ...) controls are provided by the subdevice drivers. With kernel 3.10 I have introduced bridge level image controls, but they are currently only used/activated if the subdevice doesn't already provide them (as suggested by Mauro). Hth, Frank Schäfer -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
