You could also try setting the Windows Power Plan to 'never' so that a sleep state can never activate. This would have consequences for power drain if you are on a laptop though, of course.
For further research on this subject, there is an Intel article about power-saving, and controlling the power-saving functions with SDK code. Scroll down to section 3, 'Power Savings Mechanisms in the Intel® RealSense SDK'. Section 3.3 is particularly relevant.
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I was wondering if you had the chance to try the suggestion provided by MartyG.
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Thanks for your feedback! No, I didn't have the chance to try the second solution, since I'm not a programmer and can't implement code. The system wakes from sleep fine BTW, along with the camera...
It would be really helpful for somebody from Intel to write a quick utility for setting the power plan on the camera. Or for Windows to allow choosing this.
All I want is for the camera to stay on indefinitely looking for users on the lock screen.
All the best,