Comment # 4 on bug 109178 from Jani Nikula

(In reply to Jan from comment #2)
> The samsung-laptop.ko module is enabling the use of the keyboard backlight
> keys.

This bugzilla is about display and graphics, not about keyboard. Try these
people and lists instead (or bugzilla.kernel.org, but there's a risk nobody
notices:

$ get_maintainer.pl -f ./drivers/platform/x86/samsung-laptop.c
Corentin Chary <corentin.chary@gmail.com> (maintainer:SAMSUNG LAPTOP DRIVER)
Darren Hart <dvhart@infradead.org> (maintainer:X86 PLATFORM DRIVERS)
Andy Shevchenko <andy@infradead.org> (maintainer:X86 PLATFORM DRIVERS)
platform-driver-x86@vger.kernel.org (open list:SAMSUNG LAPTOP DRIVER)
linux-kernel@vger.kernel.org (open list)

> The BIOS is put into CSM mode.

For i915 we don't really support the CSM mode. Please use UEFI instead.