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[Ubuntu Foundations Team Bug Bot <1316689@xxxxxxxxxxxxxxxxxx>]

** Tags added: patch

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Title:
  Radeon VDPAU clients crash at vlVdpDecoderCreate with 1080p videos

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I've enabled VDPAU support in flash player, and testing it with normal
  youtube videos (up to 720p) gives good results.

  However, once I switch to 1080p quality, the flash player crashes, and
  this happens at the mesa vdpau driver level because a Bus Error
  triggered by mesa since the CPU can't access properly to gpu VRAM.

  The same happens loading a 1080p video using VLC or MPlayer (see vlc
  backtrace http://paste.ubuntu.com/7405255/).

  Here's the problem as explained by Christian König:
  > It's not the VDPAU driver that's failing here, it's the kernel.
  > 
  > When the kernel can't place a buffer into visible VRAM the buffer
  > should be moved into GART instead for CPU access. But instead we
  > just return a SIGBUS to the application effectively crashing it.

  I'm attaching the patch that fixes this problem, provided by Christian
  and tested successfully on ubuntu Trusty kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  marco      2988 F.... pulseaudio
   /dev/snd/pcmC1D3p:   marco      2988 F...m pulseaudio
   /dev/snd/controlC0:  marco      2988 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue May  6 18:27:23 2014
  HibernationDevice: RESUME=UUID=534ddf57-b0f4-4367-ae56-d2878b2f614f
  InstallationDate: Installed on 2010-07-10 (1396 days ago)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  MachineType: Acer Aspire 4820TG
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=4811a166-63ca-4702-8e63-0c357cc2e2f7 ro quiet splash radeon.audio=1 radeon.dpm=1 crashkernel=384M-2G:64M,2G-:128M crashkernel=384M-2G:64M,2G-:128M crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2012-10-10 (573 days ago)
  dmi.bios.date: 03/16/2011
  dmi.bios.vendor: INSYDE
  dmi.bios.version: V1.25
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: JM41_CP
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnINSYDE:bvrV1.25:bd03/16/2011:svnAcer:pnAspire4820TG:pvrV1.25:rvnAcer:rnJM41_CP:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.name: Aspire 4820TG
  dmi.product.version: V1.25
  dmi.sys.vendor: Acer

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