When using the latest revision, 212, I receive the following error when trying 
to change the frequency filter with luvcview:

luvcview -d /dev/video0
luvcview 0.2.4

SDL information:
  Video driver: x11
  A window manager is available
Device information:
  Device path:  /dev/video0
Stream settings:
  Frame format: MJPG
  Frame size:   640x480
  Frame rate:   30 fps
ioctl querycontrol error: Invalid argument
Get value of light frequency filter error
Current light frequency filter: 50Hz
ioctl querycontrol error: Invalid argument
Switch light frequency filter error




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