Cannot adjust brightness on Dell XPS 13

[jfleck]

Hello and Thank you for reading this.

I'm running Xfce4 on Centos 7 and the only way I can adjust the brightness is through the Bios setup.

When I click on the Display settings I get "Unable to start the Xfce Display Settings".

I have tried to update the driver and it tells me I'm up to date.
-xbacklight, doesn't do anything
-brightnessctl, doesn't do anything

Linux localhost.localdomain 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

kernel-3.10.0-862.el7.x86_64
kernel-3.10.0-957.5.1.el7.x86_64
kernel-tools-3.10.0-957.5.1.el7.x86_64
kernel-tools-libs-3.10.0-957.5.1.el7.x86_64

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07)

[root@localhost jfleck]# lshw -class display
*-display UNCLAIMED
description: VGA compatible controller
product: Skylake GT2 [HD Graphics 520]
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 07
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list
configuration: latency=0
resources: memory:db000000-dbffffff memory:90000000-9fffffff ioport:f000(size=64)

Any advice or information would be greatly appricated

Thank You in advance