Hi Jani, On Sunday 06 March 2011 16:12:01 Jani Frilander wrote: > 2011/3/6 Laurent Pinchart wrote: > > Could you please send me the output of > > > > lsusb -v -d 045e:076d > > > > (running as root if possible) ? > > Gzipped file attached.
Thanks. > > Looks like the webcam has been designed by yet another brain-dead > > developer. *sigh* :-( > > Or maybe they have crippled it for a purpose. Never underestimate human stupidity :-) > > What are the minimum, maximum, default and step values reported by the > > driver when you query the exposure control ? > > Output of v4l2-ctl -l: > brightness (int) : min=30 max=255 step=1 default=133 value=153 > contrast (int) : min=0 max=10 step=1 default=5 value=5 > saturation (int) : min=0 max=200 step=1 default=83 value=83 > white_balance_temperature_auto (bool) : default=1 value=1 > power_line_frequency (menu) : min=0 max=2 default=2 value=1 > white_balance_temperature (int) : min=2800 max=10000 step=1 > default=4500 value=3935 > sharpness (int) : min=0 max=50 step=1 default=20 value=50 > backlight_compensation (int) : min=0 max=10 step=1 default=0 value=0 > exposure_auto (menu) : min=0 max=3 default=1 value=3 > exposure_absolute (int) : min=5 max=20000 step=1 default=156 value=156 According to what the camera reports, all values between 5 and 20000 should be valid. That's obviously not the case, as showed by your tests. The driver unfortunately has no way to know that only a couple of exposure values are supported by the camera. > focus_absolute (int) : min=0 max=40 step=1 default=0 value=0 > focus_auto (bool) : default=0 value=1 > zoom_absolute (int) : min=0 max=10 step=1 default=0 value=0 > > As a side note, this webcam doesn't support all exposure_auto values. > Output from guvcview, when trying out all modes: > > checking format: 1196444237 > VIDIOC_G_COMP:: Invalid argument > compression control not supported > vid:045e > pid:076d > driver:uvcvideo > VIDIOC_S_CTRL - Unable to set control: Input/output error > Exposure, Auto change to 0 failed > hardware value is 3 > VIDIOC_S_CTRL - Unable to set control: Input/output error > Exposure, Auto change to 2 failed > hardware value is 1 That's a known problem I need to fix in the driver. It will unfortunately not solve your absolute exposure issue though. -- Regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
