Normaly i do use trizen, but this time i followed philm’s advice and used pamac in the terminal
Luckily i have already moved on from kernel 4.19 to 5.10, 5.12 . And i do use noveau instead of nvidia, because “noveau” does detect both graphic-cards and does handle my 2-seat system well (nvidia-driver didn’t).
And zstd is already “my” standard for mkinitcpio.conf 
# COMPRESSION
# Use this to compress the initramfs image. By default, gzip compression
# is used. Use 'cat' to create an uncompressed image.
#COMPRESSION="gzip"
#COMPRESSION="bzip2"
#COMPRESSION="lzma"
#COMPRESSION="xz"
#COMPRESSION="lzop"
#COMPRESSION="lz4"
#akf
COMPRESSION="zstd"
But again i had to delete 2 files 
to get my lightdm from black screen 
to working 
again.
