** Description changed:

- I'll add detail later
- likely package should be xserver-xorg-video-nouveau 
+ Lubuntu groovy QA-test install.
+ 
+ On reboot, the login greeter (sddm) screen isn't nice, with areas of the
+ screen flashing white/black/white/black (maybe white & black each second
+ like a ":" might flash on the clock, only the ":" on the clock is
+ static)
+ 
+ likely package at fault should be xserver-xorg-video-nouveau
+ 
+ Photo can be seen at
+ 
+ https://photos.app.goo.gl/SYPytVxtkKBEj9NY8
+ 
+ The
+ - drop down for session (not selected Lubuntu)
+ - language drop down (not US flag)
+ - white/black on login picture (not grey name)
+ 
+ flashes black & white on a cycle...
+ 
+ The top panel items will eventually stop flashing (ie. session & layout)
+ but time or certain actions cause the flashing white then black in cycle
+ to occur again.
+ 
+ ** Expected Result
+ 
+ No flashing, its irritating & potentially a problem for some with
+ certain health conditions.
+ 
+ 
+ ** Not new issue, it's occurred in the past
+ 
+ hp dx6120mt (pentium 4, 3gb, winfast clone of nvidia 7600gt)
  
  I've had this issue before on eoan on hp dx6120 i believe but cannot
- find bug report (likely not filed as that box was i386 & support was
- being dropped when I noticed it; ie. pre-release)
+ find bug report. The bug was likely not filed as that box was i386 &
+ support was being dropped when I noticed it so I didn't see any point.
+ 
+ It's not new, and no doubt relates to Nvidia cards, and I'm convinced
+ I've filed this before on dx6120 so if not eoan, disco, but I've not yet
+ found it.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: linux-image-5.8.0-18-generic 5.8.0-18.19
  ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4
  Uname: Linux 5.8.0-18-generic x86_64
  ApportVersion: 2.20.11-0ubuntu45
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  guiverc    1095 F.... pulseaudio
-  /dev/snd/controlC0:  guiverc    1095 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  guiverc    1095 F.... pulseaudio
+  /dev/snd/controlC0:  guiverc    1095 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: LXQt
  CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read 
kernel buffer failed: Operation not permitted
  Date: Thu Sep 17 11:13:50 2020
  InstallationDate: Installed on 2021-09-17 (-365 days ago)
  InstallationMedia: Lubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200916)
  IwConfig:
-  lo        no wireless extensions.
-  
-  eno1      no wireless extensions.
+  lo        no wireless extensions.
+ 
+  eno1      no wireless extensions.
  Lsusb:
-  Bus 002 Device 003: ID 046d:c534 Logitech, Inc. Unifying Receiver
-  Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
-  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-  Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 003: ID 046d:c534 Logitech, Inc. Unifying Receiver
+  Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
+  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. OptiPlex 990
  ProcFB: 0 nouveaudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-18-generic 
root=UUID=c29a66dc-4cfc-4dc1-9fe7-3c9d8a8ab4a1 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-5.8.0-18-generic N/A
-  linux-backports-modules-5.8.0-18-generic  N/A
-  linux-firmware                            1.190
+  linux-restricted-modules-5.8.0-18-generic N/A
+  linux-backports-modules-5.8.0-18-generic  N/A
+  linux-firmware                            1.190
  RfKill:
-  
+ 
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/05/2017
  dmi.bios.release: 4.6
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A20
  dmi.board.name: 06D7TR
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA20:bd05/05/2017:br4.6:svnDellInc.:pnOptiPlex990:pvr01:rvnDellInc.:rn06D7TR:rvrA00:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 990
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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https://bugs.launchpad.net/bugs/1895905

Title:
  lubuntu groovy; flashing of sddm greeter

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