At first this looks like a hardware fault to me. It looks like what
happens when I replace a laptop screen and it doesn't get a clean
electrical connection. The same can happen if it has received some bumps
and intermittently loses connections on some pins.
However there's a chance this is a kernel bug and your observation that
20.04.2 does not have a problem supports that theory...
Please:
1. Edit /etc/default/grub and change:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_psr=0"
2. Run: sudo update-grub
3. Reboot.
Does that fix the problem?
** Package changed: xorg (Ubuntu) => linux-hwe-5.11 (Ubuntu)
** Changed in: linux-hwe-5.11 (Ubuntu)
Status: New => Incomplete
--
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
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