Since yesterday, my XFCE EndeavourOS installation login screen renders in a very weird way.
Function is not otherwise compromised, I can insert my password and log in, after which the system will load and work completely correctly.
I had updated my system and also installed some software before rebooting and encountering this behaviour.
Has anyone experienced something similar?
What is your graphics card? Radeon?
Edit: If so you could try changing v-blank settings.
xfconf-query -c xfwm4 -p /general/vblank_mode -t string -s "off" --create
Then log out and back in.
I have Intel’s integrated graphics, Intel HD 520 on an i3 6100U
Should I try changing v-blank settings?
@ricklinux I tried changing the v-blank settings, but to no avail.
Interestingly enough, the issue does not present itself on the log in screen when I log out, but only when I boot my laptop from off state
Could you post the output of hwinfo --gfxcard or inxi -G?
Here are
inxi -G
Graphics: Device-1: Intel Skylake GT2 [HD Graphics 520] driver: i915 v: kernel
Device-2: Chicony USB2.0 HD UVC WebCam type: USB driver: uvcvideo
Display: x11 server: X.Org 1.20.10 driver: intel unloaded: fbdev,modesetting,vesa resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa Intel HD Graphics 520 (SKL GT2) v: 4.6 Mesa 20.2.3
and
hwinfo --gfxcard
19: PCI 02.0: 0300 VGA compatible controller (VGA)
[Created at pci.386]
Unique ID: _Znp.0P5RvoI0FHC
SysFS ID: /devices/pci0000:00/0000:00:02.0
SysFS BusID: 0000:00:02.0
Hardware Class: graphics card
Model: "Intel Skylake GT2 [HD Graphics 520]"
Vendor: pci 0x8086 "Intel Corporation"
Device: pci 0x1916 "Skylake GT2 [HD Graphics 520]"
SubVendor: pci 0x1043 "ASUSTeK Computer Inc."
SubDevice: pci 0x1280
Revision: 0x07
Driver: "i915"
Driver Modules: "i915"
Memory Range: 0xde000000-0xdeffffff (rw,non-prefetchable)
Memory Range: 0xc0000000-0xcfffffff (ro,non-prefetchable)
I/O Ports: 0xf000-0xf03f (rw)
Memory Range: 0x000c0000-0x000dffff (rw,non-prefetchable,disabled)
IRQ: 128 (22649 events)
Module Alias: "pci:v00008086d00001916sv00001043sd00001280bc03sc00i00"
Driver Info #0:
Driver Status: i915 is active
Driver Activation Cmd: "modprobe i915"
Config Status: cfg=new, avail=yes, need=no, active=unknown
Primary display adapter: #19
Please post the output of pacman -Qs xf86-video
This is it!
pacman -Qs xf86-video
local/xf86-video-amdgpu 19.1.0-2 (xorg-drivers)
X.org amdgpu video driver
local/xf86-video-ati 1:19.1.0-2 (xorg-drivers)
X.org ati video driver
local/xf86-video-fbdev 0.5.0-2 (xorg-drivers)
X.org framebuffer video driver
local/xf86-video-intel 1:2.99.917+913+g9236c582-1 (xorg-drivers)
X.org Intel i810/i830/i915/945G/G965+ video drivers
local/xf86-video-vesa 2.5.0-1 (xorg-drivers xorg)
X.org vesa video driver
Why do you have the ATI and AMDGPU drivers?
I think I may have messed up some time ago when installing a neural network software, I will try to remove them and reboot
This is why i wondered if he had Radeon because this looks like a Radeon issue that i have seen on mine.
Removing those 2 packages (and rebooting) didn’t seem to change the situation
How about:
lspci -vnn | grep -PA9 'VGA|Display|3D'
lspci -vnn | grep -PA9 'VGA|Display|3D'
00:02.0 VGA compatible controller [0300]: Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. Device [1043:1280]
Flags: bus master, fast devsel, latency 0, IRQ 128
Memory at de000000 (64-bit, non-prefetchable) [size=16M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
I/O ports at f000 [size=64]
Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
What if you uninstall the xf86-video-intel driver and reboot?
But before doing that, make sure you have the EndeavourOS USB installer available, so that you can recover your system in case something happens… 
Edit: Or you could first try with the LTS kernel:
sudo pacman -S linux-lts linux-lts-headers
Does he need to create /etc/X11/xorg.conf.d/20-intel-graphics.conf
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "TripleBuffer" "true"
Option "TearFree" "true"
Option "DRI" "false"
EndSection
Unfortunately this did not sort any effect! 
Getting a live USB ready and then I will try that!