Power driver state failure -Blue Screen ERROR in DELL XPS i5.

A stop 0x9F should not be a hardware issue in general.

But at this point I think we need a crash dump to analyze.

Follow it: Dump Files - Configure Windows to Create on BSOD

Go to Option Two, Point 2. Download the .reg file and merge it in registry by double clicking it.

Now wait for another BSOD. When it occurred, search the .dmp files manually in the default path: C:\Windows\Minidump or %SystemRoot%\Minidump. See if the crash dump is recorded or not (hopefully it will be recorded).Post it following the Blue Screen of Death (BSOD) Posting Instructions.

The last data that I checked and the last post that you made .... both points to a same thing .... the Intel WiFi driver. Now it is to know that if there is anything playing behind the stage and making Intel WiFI fail. A crash dump will give a precise view.

Hope the registry is merged rightly, without any failure?

Something that I did not expect. Frankly speaking.

It is nvidia optimus technology that is causing this issue. Most frequent for portable computers.

Before I suggest anything to you, I will ask you to questions.

1. Do you play heavy games?
2. Do you carry the computer out of home for several hours?

My suggestion to you will be based on your answer to these two questions. So answer them properly, OK? :)
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Code:

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*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
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Use !analyze -v to get detailed debugging information.

BugCheck 9F, {3, fffffa80063c0a10, fffff80000ba2748, fffffa80087364f0}

*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
c0000005 Exception in ext.Analyze debugger extension.
      PC: 00000000`00000000  VA: 00000000`00000000  R/W: 8  Parameter: 00000000`00000000
0: kd> !analyze -v
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*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
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DRIVER_POWER_STATE_FAILURE (9f)
A driver has failed to complete a power IRP within a specific time.
Arguments:
Arg1: 0000000000000003, A device object has been blocking an Irp for too long a time
Arg2: fffffa80063c0a10, Physical Device Object of the stack
Arg3: fffff80000ba2748, nt!TRIAGE_9F_POWER on Win7 and higher, otherwise the Functional Device Object of the stack
Arg4: fffffa80087364f0, The blocked IRP

Debugging Details:
------------------

c0000005 Exception in ext.analyze debugger extension.
      PC: 00000000`00000000  VA: 00000000`00000000  R/W: 8  Parameter: 00000000`00000000
0: kd> !irp fffffa80087364f0
Irp is active with 4 stacks 3 is current (= 0xfffffa8008736650)
 No Mdl: No System Buffer: Thread 00000000:  Irp stack trace.  Pending has been returned
     cmd  flg cl Device   File     Completion-Context
 [  0, 0]   0  0 00000000 00000000 00000000-00000000    

            Args: 00000000 00000000 00000000 00000000
 [ 16, 0]   0  0 fffffa80063c0a10 00000000 fffff8800f3a7c0c-fffffa800824f6a0    
           \Driver\pci    nvlddmkm
            Args: 00000000 00000000 00000000 00000000
>[ 16, 2]   0 e1 fffffa8006a00040 00000000 00000000-00000000    pending
           \Driver\nvlddmkm
            Args: 00000000 00000001 00000001 00000000
 [  0, 0]   0  0 00000000 00000000 00000000-fffffa80061afc70    

            Args: 00000000 00000000 00000000 00000000
0: kd> lmvm nvlddmkm
start             end                 module name
fffff880`0f258000 fffff880`0ff2c000   nvlddmkm T (no symbols)           
    Loaded symbol image file: nvlddmkm.sys
    Image path: nvlddmkm.sys
    Image name: nvlddmkm.sys
    Timestamp:        Sun Sep 14 01:29:50 2014 (5414A236)
    CheckSum:         00C8E3A6
    ImageSize:        00CD4000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

The fact is, you have to let either of the graphics (Intel or nvidia) go.

Nvidia one is needed for playing games those needs high graphic rendering, and all the rest (including most of the online games) can be performed nicely with the intel HD graphics that you have.

If you drop the intel graphics, nvidia graphics will not be able to keep the battery charge for long, over the entire college hours. So better you drop the nvidia graphics.

See this video .....



But dont do what is done there. Do the reverse. Use the "Integrated Graphics" instead.

Then see how it works. Let us know.