Screen Brightness low on XPS 13 7390 Ubuntu edition.

Hi guys, 
i have a strange issue: my xps screen is almost black, yesterday start flickering, only the laptop screen, and i followed the instruction on https://www.dell.com/community/Linux-General/XPS-13-7390-Ubuntu-Screen-flickering/td-p/7430121

Since this morning is almost black, when the brightness value is highest the screen is black, and now seems have only 2 values: Black or Almost Black.
Soes anyone else have the same problem?

Some info:

Kernel Version: 5.4.0-131-generic
BIOS Version: 1.18.0 

cat /sys/class/backlight/intel_backlight/brightness
108000

cat /sys/class/backlight/intel_backlight/max_brightness
120000

cat /sys/class/backlight/intel_backlight/actual_brightness
108000

And my grub setup is:

cat /etc/default/grub  | grep -v \#

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_psr=0 acpi_backlight=none"
GRUB_CMDLINE_LINUX=""