System information (version)

• OpenCV => both 4.0.1 and 4.1.0
• Operating System / Platform => Ubuntu 16.04 x64
• Compiler => g++ 5

Detailed description

I followed the solution in #9738: I set AutoExposure to 0.25 first but found that the solution no longer works.
I cannot disable AutoExposure and setting Exposure property didn't change anything.

Steps to reproduce

import cv2

cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_AUTO_EXPOSURE, 0.25)
cap.set(cv2.CAP_PROP_EXPOSURE, -7.0)

while True:
	ret, frame = cap.read()
	cv2.imshow('test', frame)
	cv2.waitKey(1)