Screen backlight issues after installing kernel 5.19

photos.app.goo.gl/XqiV8p1ZU7FK5vQRA

Yesterday I decided to install kernel version 5.19.7-1-MANJARO. After two hours of using the computer, I rebooted it due to lags. After a reboot, xfce stopped running.

These are all the messages that I saw at startup:

/dev/sda1: clean, 1627541/61054976 files, 75107376/244189752 blocks

[FAILED] Failed to start Load/Save Screen Backlight Brightness of leds:dell::kbd

After them, the cursor blinks on a blank screen.
Please help because this is the first time I’ve encountered this error.

(I tried to run the OS with different kernels, but with none of the ones I installed, the problem did not disappear)

Log in from that TTY and run:
systemctl disable systemd-backlight@leds:dell::kbd_backlight.service
then run
systemctl reboot

See if that helps.

No, unfortunately it did not help :frowning:
Again the same messages and the same blinking cursor on a blank screen…

What does the journal show?
journalctl -eu systemd-backlight@leds:dell::kbd_backlight.service

Google Photos

How about:
sudo systemctl disable systemd-backlight@leds\:dell\:\:kbd_backlight.service

or

sudo systemctl mask systemd-backlight@leds\:dell\:\:kbd_backlight.service

The message was removed, but the problem is not in this service.
Even with this message the system started up fine!

DE still won’t start

so switch back to the 5.15 and see if you can boot

And starting manually the lightdm.service does not help either? How about startx once you log in from TTY?

No, i don’t see any changes

Apparently lightdm starts, but the endlessly blinking cursor does not leave me

so try clearing some space, run this:
sudo pacman -Scc
run again: startx and see if it helped
if not, are the any logs on the screen when you run startx? if yes take a picture of them

[  8474.272] 
X.Org X Server 1.21.1.4
X Protocol Version 11, Revision 0
[  8474.272] Current Operating System: Linux konstantin-inspiron5558 5.19.7-1-MANJARO #1 SMP PREEMPT_DYNAMIC Mon Sep 5 10:16:57 UTC 2022 x86_64
[  8474.272] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.19-x86_64 root=UUID=b9f551cf-2a5d-4966-bcaa-70c45cb02b43 rw quiet udev.log_priority=3
[  8474.272]  
[  8474.272] Current version of pixman: 0.40.0
[  8474.272] 	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
[  8474.272] Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[  8474.273] (==) Log file: "/home/konstantin/.local/share/xorg/Xorg.0.log", Time: Wed Oct  5 18:26:31 2022
[  8474.273] (==) Using config directory: "/etc/X11/xorg.conf.d"
[  8474.273] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[  8474.273] (==) No Layout section.  Using the first Screen section.
[  8474.273] (==) No screen section available. Using defaults.
[  8474.273] (**) |-->Screen "Default Screen Section" (0)
[  8474.273] (**) |   |-->Monitor "<default monitor>"
[  8474.273] (==) No device specified for screen "Default Screen Section".
	Using the first device section listed.
[  8474.273] (**) |   |-->Device "Device0"
[  8474.273] (==) No monitor specified for screen "Default Screen Section".
	Using a default monitor configuration.
[  8474.273] (==) Automatically adding devices
[  8474.273] (==) Automatically enabling devices
[  8474.273] (==) Automatically adding GPU devices
[  8474.273] (==) Automatically binding GPU devices
[  8474.273] (==) Max clients allowed: 256, resource mask: 0x1fffff
[  8474.273] (WW) The directory "/usr/share/fonts/OTF" does not exist.
[  8474.273] 	Entry deleted from font path.
[  8474.273] (WW) The directory "/usr/share/fonts/Type1" does not exist.
[  8474.273] 	Entry deleted from font path.
[  8474.273] (WW) The directory "/usr/share/fonts/100dpi" does not exist.
[  8474.273] 	Entry deleted from font path.
[  8474.273] (WW) The directory "/usr/share/fonts/75dpi" does not exist.
[  8474.273] 	Entry deleted from font path.
[  8474.273] (==) FontPath set to:
	/usr/share/fonts/misc,
	/usr/share/fonts/TTF
[  8474.273] (==) ModulePath set to "/usr/lib/xorg/modules"
[  8474.273] (**) Extension "Composite" is enabled
[  8474.273] (**) Extension "RENDER" is enabled
[  8474.274] (II) The server relies on udev to provide the list of input devices.
	If no devices become available, reconfigure udev or disable AutoAddDevices.
[  8474.274] (II) Module ABI versions:
[  8474.274] 	X.Org ANSI C Emulation: 0.4
[  8474.274] 	X.Org Video Driver: 25.2
[  8474.274] 	X.Org XInput driver : 24.4
[  8474.274] 	X.Org Server Extension : 10.0
[  8474.275] (++) using VT number 2

[  8474.276] (II) systemd-logind: took control of session /org/freedesktop/login1/session/_31
[  8474.277] (II) xfree86: Adding drm device (/dev/dri/card0)
[  8474.277] (II) Platform probe for /sys/devices/pci0000:00/0000:00:02.0/drm/card0
[  8474.277] (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 13 paused 0
[  8474.279] (--) PCI:*(0@0:2:0) 8086:1616:1028:06ae rev 9, Mem @ 0xf6000000/16777216, 0xe0000000/268435456, I/O @ 0x0000f000/64, BIOS @ 0x????????/131072
[  8474.279] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
[  8474.279] (II) LoadModule: "glx"
[  8474.279] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[  8474.281] (II) Module glx: vendor="X.Org Foundation"
[  8474.281] 	compiled for 1.21.1.4, module version = 1.0.0
[  8474.281] 	ABI class: X.Org Server Extension, version 10.0
[  8474.281] (II) LoadModule: "vesa"
[  8474.281] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[  8474.281] (II) Module vesa: vendor="X.Org Foundation"
[  8474.281] 	compiled for 1.21.1.3, module version = 2.5.0
[  8474.281] 	Module class: X.Org Video Driver
[  8474.281] 	ABI class: X.Org Video Driver, version 25.2
[  8474.281] (II) VESA: driver for VESA chipsets: vesa
[  8474.281] xf86EnableIO: failed to enable I/O ports 0000-03ff (Operation not permitted)
[  8474.281] vesa: Refusing to run, Framebuffer or dri device present
[  8474.281] vesa: Refusing to run, Framebuffer or dri device present
[  8474.281] (EE) No devices detected.
[  8474.281] (EE) 
Fatal server error:
[  8474.281] (EE) no screens found(EE) 
[  8474.281] (EE) 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
[  8474.281] (EE) Please also check the log file at "/home/konstantin/.local/share/xorg/Xorg.0.log" for additional information.
[  8474.281] (EE) 
[  8474.291] (EE) Server terminated with error (1). Closing log file.

there is something related to vesa, did you installed it? post output from:
mhwd -l && mhwd -li

Remembered!
I also decided to install the hardware drivers in the Manjaro Settings Manager, and installed the latest drivers for video-linux, video-modesettings and video-vesa.
Could this affect the launch of the interface?

You really do not need those, and video-vesa most likely is not helping your system because is a generic fallback driver which should not be used in the vast majority of cases.

So, i just need to uninstall these drivers?