Maxime,

> On windows I just drag the slider of the exposure setting from 0 to 4, and it 
> just works !

this is even stranger, if I remember correctly there are several
exposure controls in the uvc spec:

Exposure, Auto defines the exposure mode:
 0 - "Auto Mode",
 1 - "Manual Mode",
 2 - "Shutter Priority Mode",
 3 - "Aperture Priority Mode"

Exposure, Absolute: the absolute value for the exposure (in your case
from 20 to 5000)

Exposure, Auto Priority: if set bypasses the absolute value given
priority to the hardware exposure algorithm

But you are saying that in windows you get a single slider from 0 to 4 ??
Is this for Exposure, Auto or Exposure, Absolute ?

Best regards,
paulo
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