** Changed in: linux (Ubuntu Xenial)
     Assignee: Robert Hooker (sarvatt) => (unassigned)

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https://bugs.launchpad.net/bugs/1608042

Title:
  64-bit XUbuntu 16.04 "Xenial" hybrid graphics (Intel + AMD): AMDGPU
  crashes / freezes / hangs entire system

Status in linux package in Ubuntu:
  Triaged
Status in xserver-xorg-video-amdgpu package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  Triaged
Status in xserver-xorg-video-amdgpu source package in Xenial:
  Confirmed

Bug description:
  COMPUTER: Dell Inspiron 5548 laptop

  CPU: Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz

  GRAPHICS: Intel-AMD hybrid:
  - CPU-integrated: Intel Corporation Broadwell-U Integrated Graphics (driver: 
i915)
  - GPU: Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT [Radeon R7 M260/M265] 
(driver: amdgpu)

  OPERATING SYSTEM: 64-bit GNU/Linux XUbuntu 16.04 "Xenial"

  KERNEL: 4.4.0-31-generic

  PROBLEM: system hangs / freezes very frequently.
  I have Xscreensaver installed and noticed that when it's running an OpenGL 
animation (screensaver) and I move the touchpad pointer the screen freezes. I 
can still turn the keyboard LED backlight on and off (hence: keyboard doesn't 
stop working) but the pointer won't move (touchpad is locked) and I can't 
Ctrl-Alt-F[1-6] (switch TTY/terminals). Only solution is to power off my laptop 
(press and hold the power button).

  I usually select the "Molecule" screensaver (it uses OpenGL), then I
  click the "preview" button and wait for about 20 seconds, then I click
  the touchpad and the computer hangs.

  When I used XUbuntu 14.04 "Trusty" with AMD's fglrx (proprietary)
  driver I didn't experience such issue. After upgrading to 16.04
  "Xenial" (which doesn't support fglrx module/driver) amdgpu module is
  loaded by default but very frequently hangs the entire system.

  Sometimes I'm quick enough to go to TTYS1 and then I get to see some
  messages such as "HARD LOCKUP on CPU0" and "HARD LOCKUP on CPU1".
  However, it's not a hardware problem because I've already executed the
  Dell Hardware Diagnostics straight from the boot (it's an EFI
  utility), it tested all the hardware components (CPU, GPU, RAM,
  keyboard, touchpad, hard disk etc.) and didn't detect any faulty
  component.

  The attached file "amdgpu-bug.txt" is the reason why I'm pretty
  convinced that the problem is being caused by the amdgpu driver
  (although it seems to be related to how it interacts with the kernel,
  thus maybe the problem is kernel-related).

  WORKAROUND: Boot from GRUB with the nomodeset parameter. The graphics
  performance becomes terribly slow.

  -----
  Apport output:

  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  BootLog:

  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: XFCE
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
     Subsystem: Dell Broadwell-U Integrated Graphics [1028:0643]
     Subsystem: Dell Topaz XT [Radeon R7 M260/M265] [1028:0643]
  InstallationDate: Installed on 2016-07-29 (1 days ago)
  InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  MachineType: Dell Inc. Inspiron 5548
  Package: xorg 1:7.7+13ubuntu3
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic.efi.signed 
root=UUID=24cb3fff-5c01-4674-9c59-58d7d776fd70 ro quiet splash nomodeset 
vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Renderer: Software
  Tags:  xenial ubuntu
  Uname: Linux 4.4.0-31-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip fax floppy lpadmin netdev plugdev 
sambashare scanner sudo tape users video
  _MarkForUpload: True
  dmi.bios.date: 10/12/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 0YDTG3
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A02
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A06
  dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd10/12/2015:svnDellInc.:pnInspiron5548:pvrA06:rvnDellInc.:rn0YDTG3:rvrA02:cvnDellInc.:ct8:cvrA06:
  dmi.product.name: Inspiron 5548
  dmi.product.version: A06
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2

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