I wonder why there is no progress here at all. Nobody seems to have found any devices that are OK. Well, now I can report that I have. I got a new laptop at work, the Lenovo T470s and after using it 3 months, I can confirm that it does not give me eye strain. Based on my own tests with a DSLR, it does not seem to have PWM. The display adapter processor is pretty low power HD 520, so this could be one reason why it does not irritate the eyes as several other laptops with HD 620 and 630 have produced eye strain, even when they have not had PWM.
I have no idea why this is the case, but finally there is one laptop that does not produce eye strain, from these more recent laptops. The previous that didn't was a Lenovo T420 but that needed to be on 100% brightness to disable the PWM.
I really wonder why this topic does not gain any momentum globally. Every day I see people in meetings - they come in with clear white eyes, but after staring a 240Hz PWM television for a couple of hours, they have bloodshot eyes (Like I have). I see this more and more. Eye doctors just brush this off as dry eyes, Yes, could be that dry eyes are a factor here, but I think the dryness is a result of the PWM instead of the cause of the bloodshot eyes.
This is clear in my case at least, since I've had this problem for 25 years and if I have a display that does not flicker, I have no problems with bloodshot eyes or any irritation. Once there is a PWM or some dithering or some such, my eyes become irritated instantly.
It is worrisome that many mobile phone manufacturers are moving to OLED screens now as those at the moment all have PWM of 240Hz and are unusable to us who are sensitive to flicker. I fear that soon there will be no smartphone that would be usable for me.