This issue can re-created by booting the Lubuntu daily live (hirsute), logging out and as you go to `sddm` you see the issue. done with today's hirsute daily.
@Kai-Heng Feng (kaihengfeng) Using the installation done in comment #21-22, I added - lightdm no issues discovered, I could login normally and no issues discovered in quick play. I did a few groovy Xubuntu installs on this, it was where I discovered other issues, but I don't recall flashing-issues. I also noted Kubuntu is available on the list of sessions, so I tried that.. The kubuntu wasn't usable though; the characters on screen icons are missing.. eg. what I think is supposed to be "Computer" showed as "Co pute" one time, next time only the "t" was missing.. Some issues I wonder if missing packages, but there are graphic issues it feels like here. - gdm3 this doesn't look right. I've taken numerous photos, so I'll upload and paste links, but I'll also find & boot a Ubuntu desktop to compare so I can better describe issues. Once logged in lubuntu was good just as with lightdm/xdm/sddm (issues if I used kubuntu identical to those experienced with lightdm as greeter) The issue with gdm3 is not the same, it's NOT flashing, however graphics just don't like as I believe they should (white areas on screen appears to be issue rather than the flashing). More to come.. No -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1895905 Title: lubuntu groovy; flashing of sddm greeter Status in linux package in Ubuntu: Confirmed Bug description: Lubuntu groovy QA-test install on dell [optiplex] 990 (i7-2600, 16gb, nvidia geforce gt 6600 gt) 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. 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 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. 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 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 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. --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu45 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: guiverc 950 F.... pulseaudio /dev/snd/controlC0: guiverc 950 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: LXQt CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted DistroRelease: Ubuntu 20.10 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. 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 MachineType: Dell Inc. OptiPlex 990 Package: linux (not installed) 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 ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4 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 RfKill: Tags: groovy Uname: Linux 5.8.0-18-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sudo _MarkForUpload: True 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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