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

[Nathan Bryant]

Hi Daniel,

No, not multi-GPU. It's an AMD system with no integrated graphics and
only one Nvidia card. One monitor plugged in, one TV plugged in to that
card via HDMI. But the TV is usually turned off, and disabled in
Settings | Displays.  Running Xorg, not Wayland.

This doesn't look like bug 1876632; it's not suspend- or VT-switch-
related. Maybe I shouldn't have called it "corruption"; what I'm seeing
looks like gnome-terminal just... deciding not to render something that
it should; characters don't echo. No wild colors or randomized textures
or anything like that. Seems like either a problem within gnome-
terminal, or GPU command buffers just getting dropped on the floor.
Awfully similar to this bug.

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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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