I've had a question on a Portuguese forum and a bug report on bugzilla regarding a few issues with Samsung and backlight. Disabling 'Dim when idle' does fix the issue (alongside with a grub entry: acpi_backlight=vendor).
I'm sure probably some people have run against this, and I've found some sources on github (Greg KH). I haven't checked the license of them, but... what would be the best way to grab a fix for this users (even if it's from an external repository)... For what I could found out, two things are needed:
- samsung-backlight - samsung-tools.
Anyone knows where's upstream for this so I can dig up a bit more... My google searches were somehow confusing and innefective.