Public bug reported:

I am running Ubuntu 16.04 since at least four months, always with the
nvidia proprietary drivers (installed from the repository). I used
nvidia-361 for a while with no issues (and i need it for steam gaming).
However, an update installed on my machine yesterday breaks the nvidia
drivers. I tried purging the driver, rebooting and reinstalling and i
tried a newer version for the ubuntu-drivers ppa. Nothing helps: With
the nvidia driver installed, i get a low-resolution login screen, but
cannot login due to missing 3d acceleration. Running on nouveau works
fine.

This seems very strange to since everything worked until this afternoon.
Yesterday, i was happily playing games on steam, installed some updates
and now, my graphics are broken.


$ lspci | grep NVIDIA
01:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 750] 
(rev a2)
01:00.1 Audio device: NVIDIA Corporation Device 0fbc (rev a1)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Mon Apr 25 17:45:12 2016
DistUpgraded: 2016-03-11 21:34:38,175 DEBUG enabling apt cron job
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 4.4.0-21-generic, x86_64: installed
 virtualbox, 5.0.18, 4.4.0-18-generic, x86_64: installed
 virtualbox, 5.0.18, 4.4.0-21-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 NVIDIA Corporation GM107 [GeForce GTX 750] [10de:1381] (rev a2) (prog-if 00 
[VGA controller])
   Subsystem: Palit Microsystems Inc. GM107 [GeForce GTX 750] [1569:1381]
InstallationDate: Installed on 2016-01-05 (110 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed 
root=UUID=ed669b2d-c3af-4570-9eb7-2978557208ae ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg crash
UpgradeStatus: Upgraded to xenial on 2016-03-11 (44 days ago)
dmi.bios.date: 05/18/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.30
dmi.board.name: H97 Performance
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP2.30:bd05/18/2015:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH97Performance:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Mon Apr 25 17:44:29 2016
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.3-1ubuntu2
xserver.video_driver: modeset

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 crash ubuntu xenial

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https://bugs.launchpad.net/bugs/1574732

Title:
  Regression: Update in 16.04 from last days renders nvidia driver
  unusable

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