Comment 0 for bug 1315156

After upgrading to Trusty, I briefly used the nouveau driver to check whether bug 1243557 still existed; after finding that it did, I switched back to nvidia-331.

However since then, frequently (>50% but not always), the system loads nouveau first, then fails to load nvidia-331 because of this:

Apr 30 08:00:29 lap14 kernel: [ 17.789267] nouveau [ DEVICE][0000:01:00.0] BOOT0 : 0x0d9160a1
Apr 30 08:00:29 lap14 kernel: [ 17.789269] nouveau [ DEVICE][0000:01:00.0] Chipset: GF119 (NVD9)
Apr 30 08:00:29 lap14 kernel: [ 17.789271] nouveau [ DEVICE][0000:01:00.0] Family : NVD0
[...]
Apr 30 08:00:32 lap14 kernel: [ 21.574983] NVRM: The NVIDIA probe routine was not called for 1 device(s).
Apr 30 08:00:32 lap14 kernel: [ 21.574987] NVRM: This can occur when a driver such as:
Apr 30 08:00:32 lap14 kernel: [ 21.574987] NVRM: nouveau, rivafb, nvidiafb or rivatv
Apr 30 08:00:32 lap14 kernel: [ 21.574987] NVRM: was loaded and obtained ownership of the NVIDIA device(s).

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: nvidia-331 331.38-0ubuntu7
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Thu May 1 22:08:36 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-01-25 (827 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: nvidia-graphics-drivers-331
UpgradeStatus: Upgraded to trusty on 2014-04-29 (2 days ago)
modified.conffile..etc.modprobe.d.nvidia.331.hybrid.conf: [deleted]