Public bug reported:
On the internal eDP display, a thin horizontal band of approximately 2-5
pixels is visible at the bottom of the screen. The band flickers
continuously and appears to be a copy/wrap of content from the top of
the framebuffer. It is present at all times during normal desktop use
and is not caused by any specific application. The issue is present from
the moment the desktop loads and persists regardless of what is
displayed on screen.
The issue reproduces across desktop environments (Xfce, KDE Plasma) and
compositors (xfwm4, picom, none). It also reproduces on a Fedora 42 live
ISO, ruling out a Ubuntu-specific regression.
Switching to nomodeset eliminates the artifact completely, confirming
the issue is specific to the i915 KMS driver's handling of this panel.
Panel: LG LP140WF6-SPB1, 6bpc, eDP
GPU: Skylake HD 520 (device ID 1916)
Symptom: 2-5px flickerin band at bottom of screen, visually resembles wrapped
framebuffer
nomodeset fixes it completely
HDMI output unaffected
Reproduces on Fedora live ISO
PSR=0, FBC=0, compositor disabled — no effect
dither=yes, bpp=18 from i915_display_info
BIOS up to date per fwupd
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: vitor 2146 F.... wireplumber
/dev/snd/seq: vitor 2111 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: XFCE
Date: Sat Aug 8 19:26:20 2026
InstallationDate: Installed on 2025-10-28 (284 days ago)
InstallationMedia: Xubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827)
MachineType: LENOVO 80S7
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-29-generic
root=UUID=0c9049cd-dfe0-40f8-8b0a-3ec30200833c ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-01-22 (198 days ago)
dmi.bios.date: 06/19/2018
dmi.bios.release: 1.31
dmi.bios.vendor: LENOVO
dmi.bios.version: 0VCN31WW(V1.15)
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo YOGA 510-14ISK
dmi.ec.firmware.release: 1.31
dmi.modalias:
dmi:bvnLENOVO:bvr0VCN31WW(V1.15):bd06/19/2018:br1.31:efr1.31:svnLENOVO:pn80S7:pvrLenovoYOGA510-14ISK:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrLenovoYOGA510-14ISK:skuLENOVO_MT_80S7_BU_idea_FM_YOGA510-14ISK:pfaYOGA510-14ISK:
dmi.product.family: YOGA 510-14ISK
dmi.product.name: 80S7
dmi.product.sku: LENOVO_MT_80S7_BU_idea_FM_YOGA 510-14ISK
dmi.product.version: Lenovo YOGA 510-14ISK
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2163092
Title:
i915: 2-5px flickering band at the bottom of the screen on eDP-1 with
LP140WF6-SPB1 panel (Skylake HD 520)
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