Update: I got the same issue on Ubuntu 20.04.2. Looks like this isn't a kernel issue after all. Thanks a ton for the pointer Daniel, I'll return the machine or dig into the hardware.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-hwe-5.11 in Ubuntu. https://bugs.launchpad.net/bugs/1950355 Title: Intense screen flickering, vertical rainbow bars, display problems on Ubuntu 20.04, Lenovo X1 Carbon Status in linux-hwe-5.11 package in Ubuntu: Incomplete Bug description: (Initial post on ask ubuntu, copy pasted: https://askubuntu.com/questions/1359955/intense-screen-flickering- vertical-rainbow-bars-display-problems-on-ubuntu-20) Starting today (Aug 24) I observed intense screen flickering and tearing on my Ubuntu 20.04.3 on the Lenovo X1 Carbon. As far as I know, there were no shutdowns, updates, or changes. I observed this behavior once the machine started up from sleep. Throughout the day I have restarted (and powered down) the machine several times, but the problem persists. Here is a video example: https://photos.app.goo.gl/516nAe7AUUYnAHzd7 Here is an image: https://i.stack.imgur.com/RgLvB.jpg This video was taken from a clean Ubuntu install USB, so I don't think it has to do with anything I've installed or updated in the past. The system does not have any other operating systems on it (its not dual booted). I'm using basic integrated graphics (Mesa Intel® UHD Graphics 620 (WHL GT2)). System has 16gb of RAM and a Intel® Core™ i7-8665U CPU @ 1.90GHz × 8 processor, so I don't think the issue is available processing power (although the integrated graphics could be bad). I'm already using Wayland. I tried everything in the following links: Ubuntu screen flickering https://www.reddit.com/r/Ubuntu/comments/g78o4e/screen_tearing_in_ubuntu_2004/ The flickering is most noticeable in Chrome/Firefox (regardless of enabling/disabling hardware acceleration or setting any chrome://flags). However, I've also observed it with just editing Vim in terminal. EDIT: A month later, still experiencing this issue. This problem really seems to come and go -- it will go days without issue, and then have days again where it is constant. I've noticed it on all browsers. I've noticed that closing the webbrowser seems to resolve the issue most of the time. I've noticed that this is not an issue on any extended screens, just the main screen. --- Since the above post, I tried booting into a clean live disk running Ubuntu 20.04.2. This actually worked fine, and I did not observe any strange graphical effects. As per the reply on ask ubuntu, I decided to file this bug. --- Ubuntu release Description: Ubuntu 20.04.3 LTS Release: 20.04 xorg package version: xorg: Installed: 1:7.7+19ubuntu14 Candidate: 1:7.7+19ubuntu14 Version table: *** 1:7.7+19ubuntu14 500 500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages 100 /var/lib/dpkg/status ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.11.0-38.42~20.04.1-generic 5.11.22 Uname: Linux 5.11.0-38-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.21 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Tue Nov 9 13:16:35 2021 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu DkmsStatus: virtualbox, 6.1.26, 5.11.0-37-generic, x86_64: installed virtualbox, 6.1.26, 5.11.0-38-generic, x86_64: installed ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (rev 02) (prog-if 00 [VGA controller]) Subsystem: Lenovo UHD Graphics 620 (Whiskey Lake) [17aa:2292] InstallationDate: Installed on 2021-03-15 (239 days ago) InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1) MachineType: LENOVO 20QDS3B800 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-38-generic root=UUID=9213d3af-1e40-4621-9964-1212d1070372 ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/24/2020 dmi.bios.release: 1.38 dmi.bios.vendor: LENOVO dmi.bios.version: N2HET55W (1.38 ) dmi.board.asset.tag: Not Available dmi.board.name: 20QDS3B800 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40709 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.20 dmi.modalias: dmi:bvnLENOVO:bvrN2HET55W(1.38):bd08/24/2020:br1.38:efr1.20:svnLENOVO:pn20QDS3B800:pvrThinkPadX1Carbon7th:skuLENOVO_MT_20QD_BU_Think_FM_ThinkPadX1Carbon7th:rvnLENOVO:rn20QDS3B800:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad X1 Carbon 7th dmi.product.name: 20QDS3B800 dmi.product.sku: LENOVO_MT_20QD_BU_Think_FM_ThinkPad X1 Carbon 7th dmi.product.version: ThinkPad X1 Carbon 7th dmi.sys.vendor: LENOVO version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.105-3~20.04.2 version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3~20.04.3 version.libgl1-mesa-glx: libgl1-mesa-glx 21.0.3-0ubuntu0.3~20.04.3 version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1~20.04.2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.11/+bug/1950355/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
