Slow login under Wayland

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Dear Debian/KDE community,

I'm struggling fixing this issue: when I login using Plasma-Wayland the
screen looks locked or it becomes black, then after some time (it could
take between 20 seconds and 1 minute and half) everything loads and works
fine.
The issue doesn't show with X11, but having a 2-in-1 laptop, Wayland is
absolutely better with my hardware and using GNOME-Wayland is ok too, so I
tend to think this is a KDE problem.
Can you help me to understand and solve this problem? Best regards

My system is:
Microsoft Surface Pro 9 with Intel processor and graphics
Debian/Sid
Custom kernel from the linux-surface project (the problem is present even
with the Debian stock kernel).

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<div dir=3D"ltr">Dear Debian/KDE community,<div><br></div><div>I&#39;m stru=
ggling fixing this issue: when I login using Plasma-Wayland the screen look=
s locked or it becomes black, then after some time (it could take between 2=
0 seconds and 1 minute and half) everything loads and works fine.</div><div=
>The issue doesn&#39;t show with X11, but having a 2-in-1 laptop, Wayland i=
s absolutely better with my hardware and using GNOME-Wayland is ok too, so =
I tend to think this is a KDE problem.</div><div>Can you help me to underst=
and and solve this problem? Best regards</div><div><br></div><div>My system=
 is:</div><div>Microsoft Surface Pro 9 with Intel processor and graphics</d=
iv><div>Debian/Sid</div><div>Custom kernel from the linux-surface project (=
the problem is present even with the Debian stock kernel).</div><div><br></=
div></div>

<br>
<img src=3D"https://www.unicam.it/sites/default/files/documenti-pag/2025/2-=
FIRMA-5xmille_2024_300x180px2.png"><br>
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