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[Doug McMahon <1479378@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1501041 ***
    https://bugs.launchpad.net/bugs/1501041

** This bug has been marked a duplicate of bug 1501041
   No visible display in ubuntu session when using nvidia drivers via nvidia-prime until screen goes to sleep, then waked up

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https://bugs.launchpad.net/bugs/1479378

Title:
  Nvidia prime black screen on boot

Status in nvidia-prime package in Ubuntu:
  New

Bug description:
  $ lsb_release -rd
  Description:    Ubuntu 15.04
  Release:        15.04

  $ apt-cache policy nvidia-346 nvidia-prime
  nvidia-346:
    Installato: 346.59-0ubuntu1
    Candidato:  346.59-0ubuntu1
    Tabella versione:
   *** 346.59-0ubuntu1 0
          500 http://it.archive.ubuntu.com/ubuntu/ vivid/restricted amd64 Packages
          100 /var/lib/dpkg/status
       346.46-0ubuntu1 0
          500 http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1410/x86_64/  Packages
  nvidia-prime:
    Installato: 0.8.1
    Candidato:  0.8.1
    Tabella versione:
   *** 0.8.1 0
          500 http://it.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
          100 /var/lib/dpkg/status

  $ lspci -v
  [...]

  01:00.0 VGA compatible controller: NVIDIA Corporation GK107GLM [Quadro K1100M] (rev a1) (prog-if 00 [VGA controller])
          Subsystem: Dell Device 15cc
          Flags: bus master, fast devsel, latency 0, IRQ 38
          Memory at f3000000 (32-bit, non-prefetchable) [size=16M]
          Memory at d0000000 (64-bit, prefetchable) [size=256M]
          Memory at e0000000 (64-bit, prefetchable) [size=32M]
          I/O ports at e000 [size=128]
          [virtual] Expansion ROM at f4000000 [disabled] [size=512K]
          Capabilities: <access denied>
          Kernel driver in use: nvidia

  I'm using Nvidia prime with a Quadro K1100M card.
  When I switch from intel to nvidia, then after booting I randomly get a black screen [about 50% of the times]. EDIT: after latest kernel update, now it happens ALL the times!

  I can't but switch to a virtual console by pressing [Ctrl+Alt+Fn] and
  then reboot.

  output of nvidia-bug-report.sh attached

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