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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1362261 ***
    https://bugs.launchpad.net/bugs/1362261

** This bug has been marked a duplicate of bug 1362261
   CONFIG_DMA_CMA causes ttm performance problems/hangs

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https://bugs.launchpad.net/bugs/1363384

Title:
  CONFIG_DMA_CMA causes performance problems

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  After upgrade to utopic, regular freezes for some seconds to some
  minutes appeared. Linux freezes with up-to-date linux-image from
  repository (version 3.16.0-11.16). It doesn't matter, whether I use
  radeon or vesa driver.

  Discussion about the bug in either X or kernel happened on
  http://lists.freedesktop.org/archives/dri-devel/2014-August/065842.html

  WORKAROUND: Using custom kernel compiled from provided source of
  3.16.0-11.16 with CONFIG_DMA_CMA=n solves the problem.

  ---
  ApportVersion: 2.14.7-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  peto       2323 F.... pulseaudio
   /dev/snd/controlC0:  peto       2323 F.... pulseaudio
  CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
  DistroRelease: Ubuntu 14.10
  MachineType: Hewlett-Packard HP ProBook 4510s
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.1 root=UUID=b00837af-b27f-4680-8316-ab468f388e55 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Tags:  utopic utopic
  Uname: Linux 3.16.1 x86_64
  UnreportableReason: The report belongs to a package that is not installed.
  UpgradeStatus: Upgraded to utopic on 2014-08-23 (6 days ago)
  UserGroups: audio dialout firebird games libvirtd lp sudo users wireshark
  WifiSyslog:

  _MarkForUpload: True
  dmi.bios.date: 12/02/2010
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68PZI Ver. F.18
  dmi.board.name: 3074
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 24.0F
  dmi.chassis.asset.tag: CNU9375050
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68PZIVer.F.18:bd12/02/2010:svnHewlett-Packard:pnHPProBook4510s:pvrF.18:rvnHewlett-Packard:rn3074:rvrKBCVersion24.0F:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 4510s
  dmi.product.version: F.18
  dmi.sys.vendor: Hewlett-Packard

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