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[Gannet <1362261@xxxxxxxxxxxxxxxxxx>]

Does CONFIG_DMA_CMA parameter enabled in 3.13.0-35 ? Because I have no
problem with it unlike 3.16+.

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https://bugs.launchpad.net/bugs/1362261

Title:
  CONFIG_DMA_CMA causes ttm performance problems/hangs

Status in “linux” package in Ubuntu:
  Fix Committed
Status in “linux” source package in Trusty:
  Confirmed
Status in “linux” source package in Utopic:
  Fix Committed

Bug description:
  The x86_64 kernels have CONFIG_DMA_CMA enabled, this causes extrem
  hangs of at least the RADEON driver

  full discussion is here: http://lists.freedesktop.org/archives/dri-
  devel/2014-August/065842.html

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-10-generic 3.16.0-10.15
  ProcVersionSignature: Ubuntu 3.16.0-10.15-generic 3.16.1
  Uname: Linux 3.16.0-10-generic x86_64
  ApportVersion: 2.14.6-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  aschultz   2224 F.... pulseaudio
   /dev/snd/controlC1:  aschultz   2224 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Wed Aug 27 18:57:02 2014
  HibernationDevice: RESUME=UUID=702fb398-84d9-4e93-9b4b-980323bf2d53
  MachineType: Hewlett-Packard HP EliteBook 8560w
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-10-generic root=UUID=9a10044a-a505-4049-b794-a0ab87709daa ro rootflags=subvol=@ quiet splash init=/lib/systemd/systemd vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-10-generic N/A
   linux-backports-modules-3.16.0-10-generic  N/A
   linux-firmware                             1.132
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-07-21 (37 days ago)
  dmi.bios.date: 07/15/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68SVD Ver. F.42
  dmi.board.name: 1631
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 01.3D
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68SVDVer.F.42:bd07/15/2013:svnHewlett-Packard:pnHPEliteBook8560w:pvrA0001D02:rvnHewlett-Packard:rn1631:rvrKBCVersion01.3D:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 8560w
  dmi.product.version: A0001D02
  dmi.sys.vendor: Hewlett-Packard

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