Same issue here with Ubuntu 18.04 on Dell Inspiron 15R 5521.
I have tried changing
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor".
on /etc/default/grub and did not help.
Also tried the solution on https://ubuntuforums.org/showthread.php?t=2208278
and did not do anything.
Both brightness and volume keys are really slow do adjust and the brightness
ones always freeze the screen for good 5 seconds.
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https://bugs.launchpad.net/bugs/847001
Title:
Adjusting display brightness is very slow on several Dell laptops
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