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
Status in linux package in Ubuntu:
Confirmed
Bug description:
Changing the brightness via FN key combination or via the brightness applet
is very slow.
the CPUs don't seem to go to 100%, but the adjustment process seems
relatively slow.
The mouse cursor is also sluggish.
Reinstalled the OS twice, but not because of this issue and the problem seems
to persist.
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: gnome-power-manager 2.32.0-2ubuntu2.1
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
Architecture: amd64
Date: Sun Sep 11 15:29:02 2011
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GnomeSessionSuspendInhibited: No
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
MachineType: Dell Inc. Latitude E5410
ProcEnviron:
LANGUAGE=en_US:en
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-11-generic
root=UUID=0dfaacc9-c19d-425b-963d-dabb87ae18bc ro quiet splash vt.handoff=7
SourcePackage: gnome-power-manager
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/28/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: 05C67D
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA09:bd01/28/2011:svnDellInc.:pnLatitudeE5410:pvr0001:rvnDellInc.:rn05C67D:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E5410
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.
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