Public bug reported:

This bug is encountered on a computer with:

Kubuntu 21.10
MSI Gaming X Trio 3060 Ti

The following repo is used:

ppa: kubuntu-backports

GPU driver:

Nvidia driver metapackage from nvidia-driver-470(proprietary, tested)

What I expected: SDDM working just fine, showing every elements
What happened: SDDM is showing a black screen on login, logout, lockscreen. BUT 
logging in works.
What I did: Updating nvidia-driver-470 from 470.63 to 470.74
What I tried to do to fix: dpkg-reconfigure sddm

I suspect something is conflicting SDDM with the 470.74 driver.
Downgrading to 470.63 will fix this problem.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: nvidia-driver-470 470.74-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-20.20-generic 5.13.14
Uname: Linux 5.13.0-20-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Thu Oct 21 20:19:55 2021
InstallationDate: Installed on 2021-08-24 (58 days ago)
InstallationMedia: Kubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
ProcEnviron:
 LANGUAGE=en_HK:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_HK.UTF-8
 SHELL=/bin/bash
SourcePackage: nvidia-graphics-drivers-470
UpgradeStatus: Upgraded to impish on 2021-10-21 (0 days ago)

** Affects: nvidia-graphics-drivers-470 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug impish

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to nvidia-graphics-drivers-470 in Ubuntu.
https://bugs.launchpad.net/bugs/1948011

Title:
  SDDM shows a black screen when nvidia-driver-470 is updated to 470.74

Status in nvidia-graphics-drivers-470 package in Ubuntu:
  New

Bug description:
  This bug is encountered on a computer with:

  Kubuntu 21.10
  MSI Gaming X Trio 3060 Ti

  The following repo is used:

  ppa: kubuntu-backports

  GPU driver:

  Nvidia driver metapackage from nvidia-driver-470(proprietary, tested)

  What I expected: SDDM working just fine, showing every elements
  What happened: SDDM is showing a black screen on login, logout, lockscreen. 
BUT logging in works.
  What I did: Updating nvidia-driver-470 from 470.63 to 470.74
  What I tried to do to fix: dpkg-reconfigure sddm

  I suspect something is conflicting SDDM with the 470.74 driver.
  Downgrading to 470.63 will fix this problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: nvidia-driver-470 470.74-0ubuntu1
  ProcVersionSignature: Ubuntu 5.13.0-20.20-generic 5.13.14
  Uname: Linux 5.13.0-20-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu70
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: KDE
  Date: Thu Oct 21 20:19:55 2021
  InstallationDate: Installed on 2021-08-24 (58 days ago)
  InstallationMedia: Kubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
  ProcEnviron:
   LANGUAGE=en_HK:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_HK.UTF-8
   SHELL=/bin/bash
  SourcePackage: nvidia-graphics-drivers-470
  UpgradeStatus: Upgraded to impish on 2021-10-21 (0 days ago)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-470/+bug/1948011/+subscriptions


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