Long time to see desktop at start-up on Wayland+Amd Zen+ SoC

Hi folks, I have an issue on my father notebook (Huawei Matebook 14" AMD Zen+ SoC APU): at startup CachyOS KDE boot time is ok but I can see only mouse pointer on a black screen (I can move the pointer) and after 1 or 2 minutes I can see my KDE desktop.
I can tell is 100% Wayland issue on KDE with AMD Zen+ SoC because on my personal notebook with the same system CachyOS KDE +Wayland but DELL NB Intel SoC i5 11th Gen I have not problem and boot is 12 seconds.
On my father notebook switching from Wayland to X11 solve the problem, now boot time with desktop screen is 15 seconds, but with X11 I lost touchpad gestures that my father like to navigate on Firefox , so:
how can I solve the issue, how to record a log at startup to understand the problem, someone with the same issue?
Thanks

Is your dad’s notebook using any scx schedulers? You can check with either systemctl status scx or systemctl status scx_loader

thanks but seem nothing strange

systemctl status scx
○ scx.service - Start scx_scheduler
Loaded: loaded (/usr/lib/systemd/system/scx.service; disabled; preset: disabled)
Active: inactive (dead)

~
❯ systemctl status scx_loader
○ scx_loader.service - DBUS on-demand loader of sched-ext schedulers
Loaded: loaded (/usr/lib/systemd/system/scx_loader.service; disabled; preset: disabled)
Active: inactive (dead)

Is the system up-to-date?

yes, I use my dad laptop during the week and first thing I do is always update it.
I use BTRFS and GRUB so I can made a rollback at boot if needed, same story with my personal laptop that has exactly same configuration but not the same hw.

Can i get some logs? sudo cachyos-bugreport.sh could be helpful.

at the moment reverting to wayland boot sees ok, I reach Desktop in 22 seconds, not bad (and no more mouse pounter on a black screen for 2 minutes). The only change from monday is Kernel 6.12 now installed.
It seems something randomly appearing on AMD Zen+ SoC
If the problem come back again I will report here, thanks