Walter/wxl asked me to test `sddm-theme-breeze` I skipped in comment #22, report posted (https://discourse.lubuntu.me/t/login-screen- flashes/1634/17?u=guiverc) days ago now pasted here
--- I added `sddm-theme-breeze` and rebooted, yuk! (I had forgotten to perform the `sudo update-alternatives --config sddm-ubuntu-theme` step but `sddm` had been changed by the additional of a virtual keyboard) making it harder to use. I've seen this before (*semi-recently with dual screens*) and recalled the on-screen keyboard appearing on secondary display, but it booted with keyboard drawn on black background, on mouse movement etc it would flash between black, on-screen keyboard (using 2/3rds of single display) & background.. *yuk* If a user watched the display, they'd have trouble being able to login. `sddm` is still working, if I close my eyes & login as I'd expect it to operate, I'm logged in, but visually it's a mess & unusable on that box. The behavior is very familiar though, I added `kubuntu-desktop` to my Lubuntu *focal* installs on d755-5 (mentioned 4 messages up, AMD and flashing `sddm`; [lp 1865837](https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1865837)) and that box has only single display and it had the same behavior if I recall correctly. (*it was also added to hp8200 install which has the two displays*) Finally I performed the `sudo update-alternatives --config sddm-ubuntu- theme` to make the 'new' breeze default, and on reboot it hung before eventual shutdown...errors? `sddm` didn't appear again. The GUI session now has a large pointer, which I can move around with the mouse, but nothing more. I can fix this currently by changing the theme to something else, but with the virtual keyboard appearing on all themes now, they're all rather annoying.. I've taken some photos of messages I see on screen (sddm-greeter & nouveau) but my phone is being annoying (no messages in `dmesg` or `journalctl` which I could easily paste; & `/var/log/sddm.log` is empty). Most messages appear during shutdown which was ultra slow with breeze the default. Switching to another theme and shutdown returns to normal, messages gone (*just virtual terminal remains which isn't helpful*). The one message I get on text terminal (with breeze active) is `[ 120.676863] nouveau 0000:01:00.0: DRM: GPU lockup - switching to software fbcon` written after the "Optiplex990 login:" Either a requirement is missing (package error) or we're missing something in config?? -- links to photos - shutdown messages https://photos.app.goo.gl/Yf5pK28w4FMUmSi17 https://photos.app.goo.gl/VBvvRrzKMDWjxPjx5 - switching to text terminal; message https://photos.app.goo.gl/nRJEGJHd45WoenSb8 --- Additional note, the switching-to-text-terminal message (last photo link) I saw once today too, I think when using `gdm3`, but I don't believe I did when using `lightdm`. If this detail is useful, I'd need to re-test to confirm this -- 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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