First, I'd like to thank Martin and everyone else who contributed to this. I finally got around to mimicking what Martin came up with, namely:
- PicoScope 2204A,
- 100,000 Ohm resistor,
- 9V battery.
When I started, I had never used an oscilloscope, but it was pretty easy to figure out. I am so happy that I did this. Now I don't have to guess (so much) at what's causing my nausea, headaches and tinnitus.
I do have a question that is perhaps off topic. I've configured everything I know about:
- Turning the brightness all the way up,
- Going into Intel Graphics Settings and disabling the Intel power saving features (laptop only),
- Going into advanced power options and making sure that the max brightness is 100% (laptop only),
- Going into the bios and making sure that the max brightness is 100% (PC/laptop only),
- Disabling the adaptive brightness/ambient light sensor (if applicable).
But there are still times when the screen flickers with noticeable PWM under certain scenarios. For instance, on my daughter's laptop, when it's on the facial recognition screen when you're trying to log in to Windows, the screen will exhibit PWM (and therefore cause nausea, headaches and tinnitus). The screen does not flicker at full brightness when you're entering a PIN or your password - it's only on the facial recognition screen. I suppose it's trying to reduce glare in the camera.
So here's my question: does anyone know of other scenarios where we should be testing for PWM? The obvious ones are on battery vs. plugged in, and when the battery is low (say, less than 20% remaining).
My problem is that I often get nausea, headaches and tinnitus presumably caused by PWM, but I'm unable to pin down the exact source because our environment is so full of screens and the onset of my symptoms often isn't immediate. If my phone or laptop is occasionally using PWM, it might take me months to pinpoint under exactly what scenarios it happens.
tl,dr; Does anyone know of scenarios, other than what's listed above, where we should be checking for PWM?