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[Bug 2115159] [NEW] When the gnome-system-monitor window is enlarged, it uses an unreasonable amount of GPU VRAM (1+ GB)

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Public bug reported:

What I expected to happen:
- The gnome-system-monitor doesn't allocate VRAM in the GPU. If it does, at least it should be some reasonable amount.

What I observed instead:
- The gnome-system-monitor allocates VRAM in the GPU as soon as started, and allocates more of it the larger its window is resized, going past 1 GB of VRAM.

Steps to reproduce:
- Open the gnome-system-monitor, keep its window as small as allowed.
- Check the amount of GPU VRAM the gnome-system-monitor is using with nvidia-smi, it is 10 MB.
- Enlarge the gnome-system-monitor window, the amount of GPU VRAM it uses increases.
- Maximize the gnome-system-monitor window, at 2560x1440 pixels size, it uses more than 1200 MB of GPU VRAM.
- Reduce the gnome-system-monitor window size again, the amount of GPU VRAM it uses very slowly decreases again; in a matter of minutes goes down to 18 MB.

Information about the setup follows.

⮕ lsb_release -rd
No LSB modules are available.
Description:	Ubuntu 24.04.2 LTS
Release:	24.04

⮕ uname -a
Linux hokuto 6.11.0-26-generic #26~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Apr 17 19:20:47 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

⮕ apt-cache policy gnome-system-monitor
gnome-system-monitor:
  Installed: 46.0-1build1
  Candidate: 46.0-1build1
  Version table:
 *** 46.0-1build1 500
        500 http://it.archive.ubuntu.com/ubuntu noble/main amd64 Packages
        100 /var/lib/dpkg/status

⮕ cat /proc/driver/nvidia/version
NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.133.07  Fri Mar 14 13:12:07 UTC 2025
GCC version:  

⮕ nvidia-smi --query-gpu=name --format=csv
name
NVIDIA GeForce RTX 4070

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: gnome-system-monitor 46.0-1build1
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
ApportVersion: 2.28.1-0ubuntu3.7
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Jun 22 20:31:27 2025
InstallationDate: Installed on 2025-06-20 (2 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: gnome-system-monitor
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-system-monitor (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble

** Attachment added: "Screenshots with nvidia-smi output with small and large gnome-system-monitor window respectively"
   https://bugs.launchpad.net/bugs/2115159/+attachment/5885475/+files/sreenshot_bug.png

-- 
You received this bug notification because you are a member of
Debcrafters packages, which is subscribed to gnome-system-monitor in
Ubuntu.
https://bugs.launchpad.net/bugs/2115159

Title:
  When the gnome-system-monitor window is enlarged, it uses an
  unreasonable amount of GPU VRAM (1+ GB)

Status in gnome-system-monitor package in Ubuntu:
  New

Bug description:
  What I expected to happen:
  - The gnome-system-monitor doesn't allocate VRAM in the GPU. If it does, at least it should be some reasonable amount.

  What I observed instead:
  - The gnome-system-monitor allocates VRAM in the GPU as soon as started, and allocates more of it the larger its window is resized, going past 1 GB of VRAM.

  Steps to reproduce:
  - Open the gnome-system-monitor, keep its window as small as allowed.
  - Check the amount of GPU VRAM the gnome-system-monitor is using with nvidia-smi, it is 10 MB.
  - Enlarge the gnome-system-monitor window, the amount of GPU VRAM it uses increases.
  - Maximize the gnome-system-monitor window, at 2560x1440 pixels size, it uses more than 1200 MB of GPU VRAM.
  - Reduce the gnome-system-monitor window size again, the amount of GPU VRAM it uses very slowly decreases again; in a matter of minutes goes down to 18 MB.

  Information about the setup follows.

  ⮕ lsb_release -rd
  No LSB modules are available.
  Description:	Ubuntu 24.04.2 LTS
  Release:	24.04

  ⮕ uname -a
  Linux hokuto 6.11.0-26-generic #26~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Apr 17 19:20:47 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

  ⮕ apt-cache policy gnome-system-monitor
  gnome-system-monitor:
    Installed: 46.0-1build1
    Candidate: 46.0-1build1
    Version table:
   *** 46.0-1build1 500
          500 http://it.archive.ubuntu.com/ubuntu noble/main amd64 Packages
          100 /var/lib/dpkg/status

  ⮕ cat /proc/driver/nvidia/version
  NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.133.07  Fri Mar 14 13:12:07 UTC 2025
  GCC version:  

  ⮕ nvidia-smi --query-gpu=name --format=csv
  name
  NVIDIA GeForce RTX 4070

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: gnome-system-monitor 46.0-1build1
  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
  ApportVersion: 2.28.1-0ubuntu3.7
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Jun 22 20:31:27 2025
  InstallationDate: Installed on 2025-06-20 (2 days ago)
  InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: gnome-system-monitor
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-system-monitor/+bug/2115159/+subscriptions
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