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v4l2-ctl problem attempting to turn of auto exposure control on Creative Optia AF




All:

I am using the tip V4L code with a Captiva Optia AF webcam and I am
trying to turn off auto exposure via v4l2-ctl.  However, v4l2-ctl is
indicating an I/O error (see below).  I notice that the control is
listed as 'menu' and not 'int' or 'bool' as the other controls.  What
am I doing wrong?

[root@vizioconfrm104 ivtv-utils-1.3.0]# v4l2-ctl --list-ctrls
                     brightness (int)  : min=-64 max=64 step=1 default=0 value=0
                       contrast (int)  : min=0 max=64 step=1 default=32 value=32
                     saturation (int)  : min=0 max=128 step=1
default=64 value=64
                            hue (int)  : min=-40 max=40 step=1 default=0 value=0
 white_balance_temperature_auto (bool) : default=1 value=1
                          gamma (int)  : min=72 max=500 step=1
default=110 value=110
                           gain (int)  : min=0 max=100 step=1 default=0 value=0
           power_line_frequency (menu) : min=0 max=2 default=2 value=2
      white_balance_temperature (int)  : min=2800 max=6500 step=1
default=6500 value=6500
                      sharpness (int)  : min=0 max=6 step=1 default=3 value=3
         backlight_compensation (int)  : min=0 max=2 step=1 default=1 value=1
                  exposure_auto (menu) : min=0 max=3 default=3 value=3
              exposure_absolute (int)  : min=1 max=5000 step=1
default=300 value=300
         exposure_auto_priority (bool) : default=0 value=0
                 focus_absolute (int)  : min=1 max=20 step=1 default=1 value=1
                     focus_auto (bool) : default=1 value=1
                  zoom_absolute (int)  : min=0 max=3 step=1 default=0 value=0
[root@vizioconfrm104 ivtv-utils-1.3.0]# v4l2-ctl --verbose
--set-ctrl=exposure_auto=0
VIDIOC_QUERYCAP: ok
VIDIOC_S_CTRL: failed: Input/output error
exposure_auto: Input/output error
[root@vizioconfrm104 ivtv-utils-1.3.0]#

Best Regards,

-- 
Rob Krakora
Senior Software Engineer
MessageNet Systems
101 East Carmel Dr. Suite 105
Carmel, IN 46032
(317)566-1677 Ext. 206
(317)663-0808 Fax

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