Public bug reported:

Display output intermittently pauses for approximately a second, causing
the system to appear "stuttery". During freezes mouse input doesn't seem
to be registered and keyboard input is repeated, as though keys are
being held down.

Watching the journal via `journalctl -f`, the following message appears
each time the problem occurs:

Mar 31 20:16:18 luke-ultrabook kernel: nouveau 0000:02:00.0: bus: MMIO write of 
00000002 FAULT at 4188ac [ IBUS ]
Mar 31 20:16:27 luke-ultrabook kernel: nouveau 0000:02:00.0: bus: MMIO write of 
00000002 FAULT at 4188ac [ IBUS ]

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu2
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Sat Mar 31 20:11:01 2018
DistUpgraded: 2018-03-31 16:47:43,480 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
DistroCodename: bionic
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation 4th Gen Core Processor Integrated Graphics Controller 
[8086:0416] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Dell 4th Gen Core Processor Integrated Graphics Controller 
[1028:05fe]
   Subsystem: Dell GK107M [GeForce GT 750M] [1028:05fe]
InstallationDate: Installed on 2018-01-29 (61 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
MachineType: Dell Inc. XPS 15 9530
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic.efi.signed 
root=UUID=58327001-b3e0-4118-a0e6-03e8221a44f2 ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to bionic on 2018-03-31 (0 days ago)
dmi.bios.date: 07/30/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: XPS 15 9530
dmi.board.vendor: Dell Inc.
dmi.board.version: A09
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd07/30/2015:svnDellInc.:pnXPS159530:pvrA09:rvnDellInc.:rnXPS159530:rvrA09:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: XPS 15 9530
dmi.product.version: A09
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic false-gpu-hang freeze regression reproducible 
ubuntu wayland-session

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1760341

Title:
  Intermittent freeze in display output, XPS 9530 with nouveau

Status in xorg package in Ubuntu:
  New

Bug description:
  Display output intermittently pauses for approximately a second,
  causing the system to appear "stuttery". During freezes mouse input
  doesn't seem to be registered and keyboard input is repeated, as
  though keys are being held down.

  Watching the journal via `journalctl -f`, the following message
  appears each time the problem occurs:

  Mar 31 20:16:18 luke-ultrabook kernel: nouveau 0000:02:00.0: bus: MMIO write 
of 00000002 FAULT at 4188ac [ IBUS ]
  Mar 31 20:16:27 luke-ultrabook kernel: nouveau 0000:02:00.0: bus: MMIO write 
of 00000002 FAULT at 4188ac [ IBUS ]

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu5
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Sat Mar 31 20:11:01 2018
  DistUpgraded: 2018-03-31 16:47:43,480 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
  DistroCodename: bionic
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller 
[8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Dell 4th Gen Core Processor Integrated Graphics Controller 
[1028:05fe]
     Subsystem: Dell GK107M [GeForce GT 750M] [1028:05fe]
  InstallationDate: Installed on 2018-01-29 (61 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  MachineType: Dell Inc. XPS 15 9530
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic.efi.signed 
root=UUID=58327001-b3e0-4118-a0e6-03e8221a44f2 ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: Upgraded to bionic on 2018-03-31 (0 days ago)
  dmi.bios.date: 07/30/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: XPS 15 9530
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A09
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd07/30/2015:svnDellInc.:pnXPS159530:pvrA09:rvnDellInc.:rnXPS159530:rvrA09:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: XPS 15 9530
  dmi.product.version: A09
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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