SDDM resolution problems when the user closes

[Emanuele]

When I close the user session, the SSDM login manager becomes very large, the problem occurs only with NVIDIA drivers, I have a notebook with GPU intel, same version of Ubuntu, and I do not have this problem, SDDM behaves as expected.

 apt policy sddm
sddm:
  Installato: 0.18.0-1ubuntu2
  Candidato: 0.18.0-1ubuntu2
  Tabella versione:
 *** 0.18.0-1ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu disco/universe amd64 Packages
        100 /var/lib/dpkg/status

apt policy nvidia-driver-410
nvidia-driver-410:
  Installato: 410.93-0ubuntu1
  Candidato: 410.93-0ubuntu1
  Tabella versione:
 *** 410.93-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu disco/multiverse amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: sddm 0.18.0-1ubuntu2
ProcVersionSignature: Ubuntu 4.19.0-13.14-generic 4.19.20
Uname: Linux 4.19.0-13-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu21
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Feb 19 13:12:13 2019
InstallationDate: Installed on 2019-02-18 (0 days ago)
InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190130)
SourcePackage: sddm
UpgradeStatus: No upgrade log present (probably fresh install)

[Emanuele (emanuc)]

Another problem: When I close the user session and log in again with the same user or another user, the monitor resolution is wrong.
To resolve I have to restart the PC.

I attach LOG after logout and login

[Emanuele (emanuc)]

I attach LOG after logout and login