Xorg crashed with SIGABRT in OsAbort()

[Sergio Benjamim]

Trying to switch between Intel to Nvidia graphics with that option in Nvidia Settings, using an Optimus Nvidia hardware. When I logout, I got a black screen, and restart the system with Ctrl+Alt+Del.

Nvidia GeForce GT 740M
nvidia-331-updates (331.38)
nvidia-prime 0.6.2

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: xserver-xorg-core 2:1.15.1-0ubuntu2
Uname: Linux 3.14.12-031412-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
Date: Fri Jul 11 22:24:00 2014
ExecutablePath: /usr/bin/Xorg
InstallationDate: Installed on 2014-05-26 (46 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
ProcCmdline: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcEnviron:

Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 OsAbort ()
 ?? ()
 FatalError ()
 ?? ()
 __libc_start_main (main=0x7f0ac91efe50, argc=11, argv=0x7fff6f88ddc8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff6f88ddb8) at libc-start.c:287
Title: Xorg crashed with SIGABRT in OsAbort()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1338492, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

[Sergio Benjamim (sergio-br2)]

Great, now i can't switch to nvidia card anymore...

And there is no error mensage displayed in this pop-up window.

[Sergio Benjamim (sergio-br2)]

And there is no messages in terminal too, just it:

ERROR:

[Sergio Benjamim (sergio-br2)]

sudo prime-select nvidia
Error: alternatives are not set up properly
Error: nvidia mode can't be enabled

So i tried:

sudo prime-switch
sudo prime-select nvidia
sudo prime-offload
sudo prime-select nvidia
sudo prime-offload

in this sequence, logout, get a black screen, restart and got this new report bug.

It happens in kernel 3.13 and 3.14

[Alberto Milone (albertomilone)]

please try to enable the nvidia driver and attach your /var/log/gpu-manager.log

[WHK (yan-uniko-102)]

Same problem with Intel video and Mesa Driver.