kde desktop and sddm on archlinux arm

[illusoryseafloor]

My device is a Raspberry Pi 5, and I installed archlinux arm according to kiljan's tutorial and used the latest linux-rpi kernel

I manually started kde and successfully entered the desktop and everything worked fine. But I can't enter it through sddm or other display managers (I tried lightdm). No matter what display manager systemctl is started, the screen is black with only a flashing underline in the upper left corner. Is there any driver I am missing?

I don't know what I did wrong, I successfully manually enabled KDE for Wayland and successfully entered the desktop, because everything works fine so I think my driver should be fine, but sddm can't start


This is the error message of my journalctl -u sddm

Failed to read display number from pipe
Error: Could not start Display server on vt 2

My installation process is

pacman -S mesa
pacman -S plasma
pacman -S kde-applications
systemctl start sddm

Since then, the screen is black, with only a flashing underline in the upper left corner.

The above command execution process will automatically include sddm, so I did not install it manually. After the problem occurred, I tried to install sddm manually, but the result was the same. Therefore, the problem of incomplete sddm package can be ruled out.

But I successfully entered the desktop through the following command, everything is normal, even if wayland is replaced by x11, it can be entered normally

/usr/bin/startplasma-wayland


If you have the same experience or insights as me, please tell me what to do, I will be very grateful to you