Public bug reported:
Steps to reproduce: Open Firefox with multiple tabs across 3 monitors
(4K laptop + two 4K portrait displays)
XOrg CPU usage spikes upwards of 50%.
CPU usage returns to normal negligible levels when Firefox is minimised.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: xserver-xorg-core 2:21.1.12-1ubuntu1.6
ProcVersionSignature: Ubuntu 6.11.0-26.26~24.04.1-generic 6.11.11
Uname: Linux 6.11.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.capabilities.gpu0: Error: path was not a regular file.
.proc.driver.nvidia.capabilities.mig: Error: path was not a regular file.
.proc.driver.nvidia.gpus.0000.01.00.0: Error: path was not a regular file.
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
.proc.driver.nvidia.version:
NVRM version: NVIDIA UNIX x86_64 Kernel Module 535.230.02 Fri Dec 20
21:42:05 UTC 2024
GCC version: gcc version 13.3.0 (Ubuntu 13.3.0-6ubuntu2~24.04)
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Jun 17 09:22:14 2026
DistUpgraded: Fresh install
DistroCodename: noble
DistroVariant: ubuntu
DkmsStatus: nvidia/535.230.02, 6.11.0-26-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation Meteor Lake-P [Intel Arc Graphics] [8086:7d55] (rev 08)
(prog-if 00 [VGA controller])
Subsystem: Lenovo Meteor Lake-P [Intel Arc Graphics] [17aa:2234]
Subsystem: Lenovo Device [17aa:2234]
InstallationDate: Installed on 2025-06-25 (357 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
MachineType: LENOVO 21KVCTO1WW
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.11.0-26-generic
root=UUID=16576d8c-1613-4a4c-9eed-d8d9c00e3dea ro quiet splash vt.handoff=7
SourcePackage: xorg-server
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/28/2024
dmi.bios.release: 1.10
dmi.bios.vendor: LENOVO
dmi.bios.version: N48ET23W (1.10 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21KVCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76530 WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.11
dmi.modalias:
dmi:bvnLENOVO:bvrN48ET23W(1.10):bd10/28/2024:br1.10:efr1.11:svnLENOVO:pn21KVCTO1WW:pvrThinkPadP1Gen7:rvnLENOVO:rn21KVCTO1WW:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21KV_BU_Think_FM_ThinkPadP1Gen7:
dmi.product.family: ThinkPad P1 Gen 7
dmi.product.name: 21KVCTO1WW
dmi.product.sku: LENOVO_MT_21KV_BU_Think_FM_ThinkPad P1 Gen 7
dmi.product.version: ThinkPad P1 Gen 7
dmi.sys.vendor: LENOVO
modified.conffile..etc.cron.daily.apport: [deleted]
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.125-1ubuntu0.1~24.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 24.2.8-1ubuntu1~24.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1.6
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
1:1.0.17-2ubuntu0.1
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble ubuntu
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https://bugs.launchpad.net/bugs/2156943
Title:
High Xorg CPU usage (50-100%) after June 15 update to version
2:21.1.12-1ubuntu1.6
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