You have been subscribed to a public bug:
I use to press Alt+Tab to switch between windows (or frames, whatever)
and I noticed today that when I switch to another window the up bar
blinks.
I already had a display problem once, so I knew it was better with a
external video.
EDIT: I remember having this problem a year ago perhaps, and it
disappear if I reboot my computer.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.8.0-44.50~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-44-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
BootLog: Error: [Errno 13] Permission non accordée: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Thu Mar 11 10:45:08 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation HD Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA
controller])
Subsystem: Lenovo HD Graphics 620 [17aa:39e9]
InstallationDate: Installed on 2020-11-15 (115 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: LENOVO 80V0
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=fr_FR.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-44-generic
root=UUID=2342b448-1302-426d-9afd-b40fd298cdab ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/03/2018
dmi.bios.release: 2.20
dmi.bios.vendor: LENOVO
dmi.bios.version: 3PCN20WW(V2.04)
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: Lenovo ideapad 510S-13IKB
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 510S-13IKB
dmi.ec.firmware.release: 2.20
dmi.modalias:
dmi:bvnLENOVO:bvr3PCN20WW(V2.04):bd07/03/2018:br2.20:efr2.20:svnLENOVO:pn80V0:pvrLenovoideapad510S-13IKB:rvnLENOVO:rnLenovoideapad510S-13IKB:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoideapad510S-13IKB:
dmi.product.family: IDEAPAD
dmi.product.name: 80V0
dmi.product.sku: LENOVO_MT_80V0_BU_idea_FM_Lenovo ideapad 510S-13IKB
dmi.product.version: Lenovo ideapad 510S-13IKB
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.2.6-0ubuntu0.20.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.1
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
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug corruption focal ubuntu
--
Horizontal noise-like corruption
https://bugs.launchpad.net/bugs/1918619
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