System freeze after kernel: [ 3291.777274] nouveau 0000:00:0d.0: bus: MMIO write of 00000000 FAULT at 00b030

[Allan J Kelly]

Experiencing intermittent system freezes. The screen displays repeated diagonal pattern. Sometimes I can reboot via REISUB but typically no mouse or keyboard input is recognised and reset button required to reboot.

Problem appears to occur with nouveau rendering using graphics NV4C
With a normal boot graphics reported by inxi:
inxi -G
Graphics: Card: NVIDIA C61 [GeForce 7025 / nForce 630a] bus-ID: 00:0d.0
           Display Server: x11 (X.Org 1.20.5 )
           drivers: vesa,nouveau (unloaded: modesetting,fbdev)
           Resolution: 1024x768@75.03hz
           OpenGL: renderer: NV4C version: 2.1 Mesa 19.2.8 Direct Render: Yes

If I boot in recovery mode, the problem does not seem to occur with the different graphics
$ inxi -G
Graphics: Card: NVIDIA C61 [GeForce 7025 / nForce 630a]
           Display Server: x11 (X.Org 1.20.5 )
           drivers: vesa,nouveau (unloaded: modesetting,fbdev)
           Resolution: 1024x768@0.00hz
           OpenGL: renderer: llvmpipe (LLVM 9.0, 128 bits)
           version: 3.3 Mesa 19.2.8

Ubuntu 18.04 does not show any additional nvidia drivers via Software & Updates, Additional Drivers tab.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xserver-xorg-video-nouveau-hwe-18.04 1:1.0.16-1~18.04.1
ProcVersionSignature: Ubuntu 5.3.0-40.32~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-40-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Feb 17 16:26:19 2020
InstallationDate: Installed on 2019-05-10 (283 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
SourcePackage: xserver-xorg-video-nouveau-hwe-18.04
UpgradeStatus: No upgrade log present (probably fresh install)