Hello, I am getting this bug too in my Ubuntu 24.04 LTS. This wasn't happening before I upgraded from 22.04 LTS. I noticed that there is a narrow 2-pixel high invisible horizontal bar somewhere on the screen that, when the mouse cursor is inside, causes the screen to flicker heavily. It doesn't matter, if there are any windows open underneath or not. So long as the cursor's Y location fits inside, the screen will flicker. I use 1920x1080 resolution on my laptop, and by using the "xdotool getmouselocation --shell" command I found out that the location of the bar is near the bottom of the screen at Y locations 890 and 891 (seems to change across reboots?).
Do you think this bug is related to the rest of complaints about flickering screens on 24.04 and Intel i915? I am getting some of these lines in the syslog: i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun -- 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/2064017 Title: Xserver Display flickers when mouse pointer is inside narrow horizontal range band (kernel related) Status in linux package in Ubuntu: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2064017/+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
