Auto-exposure disabled at high resolutions

[TLS3]

Running the basic example «GettingStartedCapture» on Windows 10 x64 with an ELP HD webcam (1280960, YUY2 and MPEG). On sunny day, exposure is not working at «high» resolution (library cannot open device above 640480 and only on YUY2), leaving a bright white image.
On low-resolution (320*240 YUY2), auto-exposure is set and works fine.
Enclosed are 2 pictures with the 2 resolutions tested.