I have a very simple solution that solved it for me. I have an Acer Nitro with NVIDIA GeForce GTX 1650. After installing Ubuntu 22.04, every time I attached an external monitor the Xorg CPU usage was 25% - 33% even when nothing is running. This happens with driver 470 and 510.
To fix it - run the NVidia X-server settings app. Under Prime Profiles, select NVIDIA (Performance Mode). Reboot. Now Xorg CPU usage is 0.3%. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to nvidia-graphics-drivers-470 in Ubuntu. https://bugs.launchpad.net/bugs/1944667 Title: High CPU usage in Xorg with NVIDIA reverse prime external monitor Status in nvidia-graphics-drivers-470 package in Ubuntu: Expired Status in xserver-xorg-video-amdgpu package in Ubuntu: Expired Bug description: With my Legion Slim 7 in hybrid graphics mode (using amdgpu to drive the laptop display) and an external monitor connected via the nvidia card on a USB-C/HDMI connection, Xorg consistently uses around 40% CPU even with no apps running. If I put the laptop in discrete graphics mode so the nvidia card drives both the laptop display and the external monitor Xorg uses close to 0% CPU, which is what I would expect it to be in hybrid mode. ProblemType: Bug DistroRelease: Ubuntu 21.10 Package: xserver-xorg-core 2:1.20.13-1ubuntu1 ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13 Uname: Linux 5.13.0-16-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 470.63.01 Tue Aug 3 20:44:16 UTC 2021 GCC version: gcc version 11.2.0 (Ubuntu 11.2.0-5ubuntu1) ApportVersion: 2.20.11-0ubuntu69 Architecture: amd64 CasperMD5CheckResult: pass CompositorRunning: None Date: Thu Sep 23 11:48:15 2021 DistUpgraded: Fresh install DistroCodename: impish DistroVariant: ubuntu DkmsStatus: nvidia, 470.63.01, 5.13.0-16-generic, x86_64: installed nvidia, 470.63.01, 5.14.5-051405-generic, x86_64: installed nvidia, 470.63.01, 5.15.0-051500rc2-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: NVIDIA Corporation GA106M [GeForce RTX 3060 Mobile / Max-Q] [10de:2560] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Lenovo GA106M [GeForce RTX 3060 Mobile / Max-Q] [17aa:3801] Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [1002:1638] (rev c5) (prog-if 00 [VGA controller]) Subsystem: Lenovo Cezanne [17aa:380c] InstallationDate: Installed on 2021-09-15 (8 days ago) InstallationMedia: Ubuntu 21.10 "Impish Indri" - Alpha amd64 (20210910) MachineType: LENOVO 82K8 ProcEnviron: LANGUAGE=en_AU:en TERM=xterm-256color PATH=(custom, no user) LANG=en_AU.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-5.13.0-16-generic root=UUID=99f436de-d37c-4b3e-adb2-612443efc197 ro rootflags=subvol=@ quiet splash amdgpu.backlight=0 vt.handoff=7 SourcePackage: xorg-server UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/02/2021 dmi.bios.release: 1.27 dmi.bios.vendor: LENOVO dmi.bios.version: HACN27WW dmi.board.asset.tag: No Asset Tag dmi.board.name: LNVNB161216 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40697WIN dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Legion S7 15ACH6 dmi.ec.firmware.release: 1.27 dmi.modalias: dmi:bvnLENOVO:bvrHACN27WW:bd08/02/2021:br1.27:efr1.27:svnLENOVO:pn82K8:pvrLegionS715ACH6:skuLENOVO_MT_82K8_BU_idea_FM_LegionS715ACH6:rvnLENOVO:rnLNVNB161216:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrLegionS715ACH6: dmi.product.family: Legion S7 15ACH6 dmi.product.name: 82K8 dmi.product.sku: LENOVO_MT_82K8_BU_idea_FM_Legion S7 15ACH6 dmi.product.version: Legion S7 15ACH6 dmi.sys.vendor: LENOVO version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.107-1 version.libgl1-mesa-dri: libgl1-mesa-dri 21.2.1-2ubuntu2 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 2:1.20.13-1ubuntu1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200714-1ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-470/+bug/1944667/+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
