Comment 0 for bug 1316095

Unable to switch back to nvidia graphic chip after reboot.

Switching graphics does not requires reboot, but it does cause issue when user had to reboot for some reason, and will not able to use nvidia graphic until reboot.

Step to reporduce:

Switch to intel integrated graphic driver first if you were not,
open nvidia settings from dash or use following command:
$ sudo prime-select intel
then reboot

Expected result:

Able to switch back to nvidia graphic chip using nvidia settings.

Actuall result:

unable to swich back to nvidia driver, the 3D controller disapeared in pci list.

Workaround:

Shutdown the system then turn on, the 3D controller will be back.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-24-generic 3.13.0-24.46 [modified: boot/vmlinuz-3.13.0-24-generic]
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
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 1750 F.... pulseaudio
CRDA:
 country TW:
  (2402 - 2472 @ 40), (3, 27)
  (5270 - 5330 @ 40), (3, 17), DFS
  (5735 - 5815 @ 40), (3, 30)
CurrentDesktop: Unity
Date: Mon May 5 07:02:04 2014
HibernationDevice: RESUME=UUID=c19bacd6-a604-4c9b-9a21-5d0a2d9cef5c
InstallationDate: Installed on 2014-04-29 (6 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: Dell Inc. Vostro 5460
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=15cbb6aa-65e8-4596-be71-2ff7431000be ro rootdelay=60 quiet splash initcall_debug
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-24-generic N/A
 linux-backports-modules-3.13.0-24-generic N/A
 linux-firmware 1.127
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/04/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: TIE3C2
dmi.board.vendor: Dell Inc.
dmi.board.version: X00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd09/04/2013:svnDellInc.:pnVostro5460:pvr:rvnDellInc.:rnTIE3C2:rvrX00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Vostro 5460
dmi.sys.vendor: Dell Inc.