JTL http://www.notebookcheck.com/PWM-Ranking-Welche-Notebooks-Smartphones-und-Tablets-nutzen-PWM.163974.0.html (translate from German) Unfortunately many phones and tablets hard to find in Canada/US.
degen According to thee rankings, the Surface Pro 4 with Core i7 has a PWM frequency of over 10kz, while the i5 version has an appalling PWM frequency of 50 hz, unless I misunderstand the chart. Strange.
KM I parsed the site to get not only PWM Hz values but also brightness values: https://pastebin.com/r9s6bnF4
Slacor Here's the English form of the page https://www.notebookcheck.net/PWM-Ranking-Notebooks-Smartphones-and-Tablets-with-PWM.163979.0.html