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[Bug 1492864] Re: nvidia fails, likely from xserver-core


Just to note - 
On Ubuntu-gnome 15.10 install, same hardware have gotten nvidia via nvidia-prime to work. Initially on fresh install it did the same, ie. black greeter, black login.
Downgrading those 2 xorg packages & a reboot allowed nvidia to work. Then upgraded xserver back & it still worked fine. 
Today there was a kernel & some other upgrades, after reboot nvidia again failed thru several boot up attempts. Downgraded initramfs-tools/bin, reboot & works again. Upgraded initramfs-tools/bin & continues to work.
So - 
Makes no sense at all..

A fresh 15.10 Ubuntu install on same hardware today remains totally unable to use nvidia thru nvidia prime, xorg crash report on first attempted login is here, likely unremarkable & possibly worthless due to no various debug symbols - 

** Attachment added: "Screenshot from 2015-09-17 21-46-27.png"

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  nvidia fails, likely from xserver-core

Status in X.Org X server:
Status in nvidia-prime package in Ubuntu:

Bug description:
  Fresh install of 15.10, image of 09/06, only synaptic installed
  Hardware is  i7-4700MQ CPU, Intel® Haswell Mobile Nvidia GT770m

  Initial bootup/ login is fine
  Installed nvidia-352, install went fine, will attach log
  Rebooted to a black greeter screen (heard sound
  Logged in blindly, black screen
  Attached logs seem fine

  Downgrading xserver-xorg-core to 1.17.1 & nvidia works fine on optimus
  machine via nvidia-prime

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: nvidia-prime 0.8.1
  ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0
  Uname: Linux 4.2.0-7-generic x86_64
  ApportVersion: 2.18-0ubuntu9
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Sep  6 20:04:35 2015
  InstallationDate: Installed on 2015-09-06 (0 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150906)
  SourcePackage: nvidia-prime
  UpgradeStatus: No upgrade log present (probably fresh install)

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