vinkenvvt PWM is adjustable, please use the script below https://github.com/Piker-Alpha/AppleIntelFramebufferAzul.sh
JTL Could be different for earlier models but I don't notice PWM at all on my 2015 15" Macbook Pro. and furthermore I spoke with the top engineer in Apple's panel department, see my Macbook Pro thread for that.
JTL Wow. This guy's blog seems quite interesting, similar to research into BIOS's I've done in the past.