I found this command that works, so far, on all my Linux laptops, to give much greater control over backlight intensity. sudo su -c "echo 200 >/sys/class/bac

I found this command that works, so far, on all my Linux laptops, to give much greater control over backlight intensity. sudo su -c "echo 200 >/sys/class/backlight/intel_backlight/brightness" Replace 200 with another number for different brightness. Haven't found a Windows nor MacOS equivalent though. I've used it a fair bit in conjunction with Redshift to get a screen that's reasonable for reading ebooks in low light. I'd buy an e-ink laptop tomorrow if there was one.