I have the same problem with my Futjitsu Lifebook AH-531/GFO on Kubuntu
14.04.

lspci | grep 'VGA'
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core 
Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 525M] 
(rev a1)

dmesg | grep -E 'bbswitch|nvidia'
[    3.047772] nvidia: module license 'NVIDIA' taints kernel.
[    3.126575] nvidia: module verification failed: signature and/or  required 
key missing - tainting kernel
[    3.132672] nvidia 0000:01:00.0: enabling device (0000 -> 0003)
[    3.138900] [drm] Initialized nvidia-drm 0.0.0 20130102 for 0000:01:00.0 on 
minor 1
[    4.045734] bbswitch: version 0.7
[    4.045749] bbswitch: Found integrated VGA device 0000:00:02.0: 
\_SB_.PCI0.GFX0
[    4.045756] bbswitch: Found discrete VGA device 0000:01:00.0: 
\_SB_.PCI0.PEG0.PEGP
[    4.045815] bbswitch: failed to evaluate \_SB_.PCI0.GFX0._DSM 
{0xA0,0xA0,0x95,0x9D,0x60,0x00,0x48,0x4D,0xB3,0x4D,0x7E,0x5F,0xEA,0x12,0x9F,0xD4}
 0x102 0x0 {0x00,0x00,0x00,0x00}: AE_NOT_FOUND
[    4.045817] bbswitch: No suitable _DSM call found.
[   14.057221] init: Failed to spawn nvidia-persistenced main process: unable 
to execute: No such file or directory

** Attachment added: "dmidecode.log"
   
https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1310023/+attachment/4121328/+files/dmidecode.log

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https://bugs.launchpad.net/bugs/1310023

Title:
  14.04: Nvidia Prime is unable to switch to the Nvidia card

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