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Dell Inspiron 16 Plus 7620 : Strange flickering

on Dell Inspiron 16 Plus 7620
Here is a log to fix problems with it

If on XFCE/Plasma there is strange screen flickering when you open the bottom menu.

on XFCE there is this strange windows flickering : some of them, but in peculiar calamares installer.
About this defect, you can often figure out the content by trying to resize the window: but for calameres you just have to wait - because nothing updates in the window but after a while artix is installed.

Regarding the latter (3) I noticed it affects everything that uses webkit2gtk / or qt.
If you have the problem. where every webkit2gtk application flickers:
- calamares progress status when you start the installation
- epiphany (unusable)
- lightdm-webkit2-greeter
- google-chrome (but not chromium !!)
- etc...

This problem was happening because of the  driver xf86-video-intel which does not work with Intel  Alder Lake-P Integrated Graphics Controller ( Intel Iris Xe  )

what I did is: remove all

pacman -R --noconfirm xf86-input-vmmouse   
pacman -R --noconfirm xf86-video-amdgpu     
pacman -R --noconfirm xf86-video-ati       
pacman -R --noconfirm xf86-video-dummy     
pacman -R --noconfirm xf86-video-fbdev     
pacman -R --noconfirm xf86-video-intel     
pacman -R --noconfirm xf86-video-nouveau   
pacman -R --noconfirm xf86-video-openchrome 
pacman -R --noconfirm xf86-video-Risusb     
pacman -R --noconfirm xf86-video-vmware     
pacman -R --noconfirm xf86-video-voodoo

I kept only the following packages:
xf86-input-evdev xf86-input-libinput xf86-video-fbdev xf86-video-vesa

then when you install it back there is a message :

(1/1) installing xf86-video-intel                                                       
[####################################################] 100%
>>> This driver now uses DRI3 as the default Direct Rendering
    Infrastructure. You can try falling back to DRI2 if you run
    into trouble. To do so, save a file with the following
    content as /etc/X11/xorg.conf.d/20-intel.conf :
      Section "Device"
        Identifier  "Intel Graphics"
        Driver      "intel"
        Option      "DRI" "2"             # DRI3 is now default
        #Option      "AccelMethod"  "sna" # default
        #Option      "AccelMethod"  "uxa" # fallback
      EndSection

DRI2 works, flickering actually disappear from every webkit2gtk applications.
There was one problem left: the screen still black freezes in any case if I want to open the XFCE display manager...
The above UXA (older) and SNA (faster) acceleration doesn't change anything (it seems this Iris XE does not support uxa)

In the end I removed it (xf86-video-intel),
because I don't see any difference with or without it (it eats the same CPU amount when you watch a youtube video).