I installed "Samsung display driver in DKMS format" to fix brightness issue. That driver is in Samsung tools for Ubuntu PPA.
and in many cases one need to append boot loader with that acpi_backlight=vendor
Most noticeable thing for most users is likely the lack of warnings about duplicate sysfs files for backlight control on intellaptops. And if that kind of solid regression fixing doesn't get you excited, I don't know what will.
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