[Bug 2059847] Re: Input lag or freezes on Nvidia desktops with X11

[threadbareobserve]

- Ubuntu 22.04.4 LTS (5.15.0-56-generic)
- I am using X11 when nvidia driver is in use.
    - Checked via observing `XDG_SESSION_TYPE` variable
- I am using on-demand feature for nvidia but switching to performance mode only does not help.

My primary issue is keyboard input lag. It is not as bad as it used to be but it exist.
- I notice it in terminal window and vscode as these are the applications I use mostly
- Sometimes it take a few minutes to appear after a reboot sometimes it appears right away.

Other than the keyboard input lag I notice some lagging when scrolling
in Chrome. However this is less apparent.

I can't downgrade nvidia driver, this is likely an unrelated to this bug though.
- Debian package manager just install nvidia 550 regardless of the package I choose.
- `ubuntu-driver` think drivers are already installed if I try to install a specific version.
- `ubuntu-driver` autoinstall/install just install 550

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https://bugs.launchpad.net/bugs/2059847

Title:
  Input lag or freezes on Nvidia desktops with X11

Status in Mutter:
  Fix Released
Status in mutter package in Ubuntu:
  Fix Committed
Status in mutter source package in Jammy:
  In Progress
Status in mutter source package in Mantic:
  In Progress
Status in mutter source package in Noble:
  Fix Committed

Bug description:
  [ Impact ]

  Input or the entire screen may freeze at times on systems using the
  Nvidia Xorg driver with GNOME.

  [ Test Plan ]

  0. Set up a desktop with Nvidia driver 545 or 550.
  1. Log into Ubuntu, ensuring it's a Xorg session.
  2. Open a Terminal, resize it vigorously, and type several lines of text.
  3. Verify that input never froze for any perceptible period of time.
  4. Run: journalctl -b0 | grep MetaSyncRing
  5. Verify the above command does NOT show messages such as:

  Window manager warning: MetaSyncRing: Sync object is not ready -- were events handled properly?
  Window manager warning: MetaSyncRing: Sync object is not ready -- were events handled properly?
  Window manager warning: MetaSyncRing: Sync object is not ready -- were events handled properly?
  Window manager warning: MetaSyncRing: Too many reboots -- disabling

  [ Where problems could occur ]

  Anywhere in Nvidia (proprietary driver) Xorg sessions since the code
  being modified is only used with that driver.

  [ Original Description ]

  There is a noticeable delay in input while using the native terminal.
  I belive it was caused by a recent software update, as this issue is
  relatively new.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubiquity (not installed)
  ProcVersionSignature: Ubuntu 6.5.0-26.26~22.04.1-generic 6.5.13
  Uname: Linux 6.5.0-26-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia wl
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Mar 30 19:57:13 2024
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  InstallationDate: Installed on 2024-03-30 (0 days ago)
  InstallationMedia: Ubuntu 22.04.4 LTS "Jammy Jellyfish" - Release amd64 (20240220)
  SourcePackage: ubiquity
  Symptom: installation
  UpgradeStatus: No upgrade log present (probably fresh install)

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