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My machine information is following :
HP EliteBook 840 G3
Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz
VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520]
xrandr -q active mode on laptop display : 1368x768 60.01
Tried using 6.8.8-060808 kernel (instead of the lubuntu 24.04 default shipped
kernel 6.8.0-31), same issue.
Rolling back the kernel to 6.7 fixed the problem,maybe there were some video
driver changes from kernel 6.7 to 6.8 ?
While using the 6.8 kernel I did some experiments:
disabled picom in startup , no effect
Tried changing display resolution, just moves vertical position of band.
(at the above resolution 1368x768 vertical mouse pointer flicker range is
around 640 ( measured running watch -t -n 0.0001 xdotool getmouselocation from
a bash terminal)
Tried moving refresh rate slightly around 60 Hz by creating a new
modeline using cvt tool and adding new mode with xrandr, no effect.
tried connecting external display on laptop VGA port and duplicating
screen and the issue seems to disappear.
tried capturing a video of the desktop using ffmpeg with x11grab, but
it does not show the issue.
I attached a short video of the laptop display flicker I recorded using
my phone
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: xorg 1:7.7+23ubuntu3
ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
Uname: Linux 6.8.0-31-generic x86_64
ApportVersion: 2.28.1-0ubuntu2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: unknown
CompositorRunning: None
CurrentDesktop: LXQt
Date: Sun Apr 28 09:44:42 2024
DistUpgraded: Fresh install
DistroCodename: noble
DistroVariant: ubuntu
ExtraDebuggingInterest: No
GraphicsCard:
Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if
00 [VGA controller])
Subsystem: Hewlett-Packard Company EliteBook 840 G3 [103c:8079]
InstallationDate: Installed on 2024-04-25 (3 days ago)
InstallationMedia: Lubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240425.1)
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 0000:3825 USB OPTICAL MOUSE
Bus 001 Device 003: ID 8087:0a2b Intel Corp. Bluetooth wireless interface
Bus 001 Device 004: ID 05c8:0383 Cheng Uei Precision Industry Co., Ltd
(Foxlink) HP HD Camera
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: HP HP EliteBook 840 G3
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-31-generic
root=UUID=c323b5e4-1a45-4ce4-9f8d-c4f7f9c60388 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/19/2019
dmi.bios.release: 1.42
dmi.bios.vendor: HP
dmi.bios.version: N75 Ver. 01.42
dmi.board.name: 8079
dmi.board.vendor: HP
dmi.board.version: KBC Version 85.78
dmi.chassis.asset.tag: 5CG7042V5J
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.ec.firmware.release: 133.120
dmi.modalias:
dmi:bvnHP:bvrN75Ver.01.42:bd08/19/2019:br1.42:efr133.120:svnHP:pnHPEliteBook840G3:pvr:rvnHP:rn8079:rvrKBCVersion85.78:cvnHP:ct10:cvr:skuZ2A57UT#ABA:
dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI
dmi.product.name: HP EliteBook 840 G3
dmi.product.sku: Z2A57UT#ABA
dmi.sys.vendor: HP
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.120-2build1
version.libgl1-mesa-dri: libgl1-mesa-dri 24.0.5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20210115-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug corruption noble ubuntu
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Xserver Display flickers when mouse pointer is inside narrow horizontal range
band (kernel related)
https://bugs.launchpad.net/bugs/2064017
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