Public bug reported:
GNOME Activities Overview workspace thumbnails begin flickering after
several hours of uptime on Ubuntu 26.04 LTS with GNOME Shell 50.1
running on Wayland and Intel Alder Lake-N integrated graphics (i915
driver).
System:
Ubuntu 26.04 (upgraded from 24.04)
GNOME Shell 50.1 / Mutter 50.1
Wayland session (no Xorg session available)
Intel Alder Lake-N UHD Graphics (i915 driver)
Three displays (all 1920×1080 @ 60Hz)
Symptoms:
After several hours of uptime, GNOME Activities Overview becomes visually
corrupted.
Specifically, workspace thumbnails flicker immediately upon entering Overview
(Super key or hot corner).
The flickering is limited to Overview workspace thumbnails and GNOME top bar.
Normal desktop, application windows remain stable and unaffected.
Exiting Overview immediately returns the desktop to normal. Logging out and
back in resolves the issue temporarily, but it returns in minutes, rebooting it
returns after several hours. No GPU resets, hangs, or DRM errors appear in
journalctl.
I’ve tried:
Kernel parameter: intel_idle.max_cstate=1 Appears to delay or partially change
the symptoms, but the issue still occurs.
Kernel parameter: i915.enable_dc=0 Initially seemed to reduce symptoms, but the
issue still returned.
Adding i915.enable_psr=0 i915.enable_fbc=0 to GRUB also did not solve the issue.
Tested different kernels (including older kernel) No change in long-term
behavior.
Disabled a couple of third-party GNOME extensions (still using default Ubuntu
extensions).
Observations:
The issue does not affect application rendering or the desktop outside of
Activities Overview.
It appears only after extended uptime (hours), not immediately after login.
The issue is reproducible across reboots and kernel versions.
No relevant errors in journalctl related to i915, DRM, or GPU resets.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-15-generic 7.0.0-15.15
ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0
Uname: Linux 7.0.0-15-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Jun 12 19:46:59 2026
InstallationDate: Installed on 2023-10-25 (962 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
MachineType: GMKtec NucBox G2
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-7.0.0-15-generic
root=UUID=4f8f8593-25f0-4c7b-8445-d8bc2891550a ro quiet splash
i915.enable_psr=0 i915.enable_fbc=0
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-06-09 (3 days ago)
dmi.bios.date: 06/08/2023
dmi.bios.release: 5.27
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: 5.27
dmi.board.asset.tag: Default string
dmi.board.name: GMKtec
dmi.board.vendor: GMKtec
dmi.board.version: Default string
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 0
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvr5.27:bd06/08/2023:br5.27:svnGMKtec:pnNucBoxG2:pvrDefaultstring:rvnGMKtec:rnGMKtec:rvrDefaultstring:cvnDefaultstring:ct0:cvrDefaultstring:skuG2:pfaMINI:
dmi.product.family: MINI
dmi.product.name: NucBox G2
dmi.product.sku: G2
dmi.product.version: Default string
dmi.sys.vendor: GMKtec
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2156644
Title:
GNOME Panel & Activities Overview workspace thumbnails flickering
issue
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