@joekamprad my old Linksys doesn’t need electricity !!
So I’m on it to resolve it, I stopped the Network Manager.service then activate the dhcpcd one.
I tested on other OS, it works well, I downgrade to dhcpcd-8.1.7-1-x86_64.pkg.tar.zst it works well.
It seems that I have this driver r8169 where on my motherboard is 8168 !!
19:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
Subsystem: Micro-Star International Co., Ltd. [MSI] RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
Kernel driver in use: r8169
Kernel modules: r8169
I will restart and see if the dhcpcd.service will start before the network module is loaded !!
If yes I will add a /etc/modules-load.d/realtek.conf