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[Launchpad Bug Tracker <1303150@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1303150

Title:
  2.13 kernels (ALL) : Multihead multi-gpu broken for at least Nvidia
  GPUs

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  As the summary says. This is 100% repeatable and there's been a fair
  amount of traffic about it on various lists.

  The current concensus is that the root cause is down to to powersave
  mode tweaks in all GPU modules

  To repeat:

  install multiple nvidia GPUs in a desktop system (or a multi-gpu card
  such as nvidia Quadro CVS440)

  Boot up Trusty beta versions (or 2.13 kernel).

  try configuring displays using standard tools based on xrandr

  This worked fine in Saucy (crosscheck: boot off 13.10 64bit DVD)

  Apparently this is fixed in the 2.14 kernels.

  It can be worked around by manually configuring the devices in
  xorg.conf and enabling Xinerama, BUT - this results in massive
  slowdown and as this disables xrandr a number of important apps (such
  as vlc) will refuse to run.

  This is a major regression and needs to be treated as such.
  --- 
  ApportVersion: 2.14.1-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  alan       3033 F.... pulseaudio
   /dev/snd/controlC0:  alan       3033 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=68be2b9c-e944-4f7e-996d-7360074299d3
  IwConfig:
   irda0     no wireless extensions.
   
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair spl
  Package: linux (not installed)
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-23-generic ro boot=zfs root=ZFS=MAGENTA/ROOT/RARING-1 rpool=MAGENTA elevator=noop panic=30 reboot=w zswap.enabled=1 bootdegraded=true nomdmonddf nomdmonisw
  ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-23-generic N/A
   linux-backports-modules-3.13.0-23-generic  N/A
   linux-firmware                             1.127
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  Tags:  petra
  Uname: Linux 3.13.0-23-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 08/07/2008
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: JOQ3510J.86A.0942.2008.0807.1958
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: DQ35JO
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAD82085-803
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrJOQ3510J.86A.0942.2008.0807.1958:bd08/07/2008:svntranstecAG:pn:pvr:rvnIntelCorporation:rnDQ35JO:rvrAAD82085-803:cvn:ct3:cvr:
  dmi.sys.vendor: transtec AG

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