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A problem that has flabbergasted me now for a while. On a Dell Latitude E6410, everything works swimmingly when the computer runs on battery. the moment that one inserts a powerpack (e.g. connects the laptop to the electricity net), two things happen (unclear if correlated):

  • After between 10-40 minutes - the computer will become very slow and unresponsive. Initial checks don't indicate that this has to do with back-up software (e.g. dropbox or Mozypro) or virus scanner, but cannot fully rule out. This is the main problem.

  • Also - the moment that the power pack is inserted - eitehr Intel Rapid Storage Technology will "detect port 1", or if the former is disabled, Windows will suddenly detect a non-existing D: Drive / DVD drive. (which makes me wonder whehter it misreads the battery pack as an external storage location???). As said - not quite clear to me whether correlated with the problem per above, and if so, what the causal mechanism is, why the computer slows down...

Anyhow - this completely confuses me - and would love to hear any thoughts on the cause, furhter diagnosis and/or and ideally resolution of this problem...

Many thanks in advance,

W

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You could mess with your windows power options, while your waiting for an answer. If you create a new power plan you can customise it without messing with the standard plans. Then change the advanced settings. In win7 power options are much more extensive than before. –  Psycogeek Jul 29 '13 at 19:02
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Use the resource monitor in win7, very valuable tool. C:\Windows\System32\resmon.exe with it you should be able to determine what is using cpu, what is working the disk, and even what net stuff might be going on. –  Psycogeek Jul 29 '13 at 23:24
    
Thansk for ur comments. i have been using resource monitor and illustro. the weird thing is that random applications (teatimer.exe, launchy, explorer) suddenly become cpu hogs and spike up - if i close one than the other ones take over the CPU hog role. So resource monitor doesnt seem to show the "underlying cause" why there is a CPU constraint... let me know your thoughts! –  Wouter Jul 30 '13 at 17:14
    
It is my understanding that if the cpu steps down, the visable indicators of 100% usage are working in that smaller area. So i would want to see my stepping using CPUZ or rightmarks or anything that would show either the cpu Clock at the moment (some cpu monitors) or the stepping live. I do not know how (overheat) throttling displays. Then some way to test your CPU and speed in a controlled way. using prime or intelburn or something. So you can be there and SEE live. I could suspect a baddie or a bad dll too (AVcheck) also a low possibility that a hard drvie is not reacting Disk Speed test –  Psycogeek Jul 31 '13 at 1:16
    
Superhelpful. Please forgive my ignorance: • I didn’t manage to install RMclock – but installed CPUID. Which metrics should I be looking at? CPU clock numbers (Core Speed, Multiplier, Bus speed, QPI link)? – although they didn’t seem to change much at slowdown. Should I look at other indices / metrics? • When you mention AVcheck - do you mean there is maybe process AVcheck.dll that I should check if it is running on my comp, or is this a program that I should download? • Disk speed test – do you recommend downloading a specific one? Many thanks in advance, very helpful, W –  Wouter Jul 31 '13 at 15:53
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1 Answer

This is usually caused by the 'Connected' power scheme having too many power restrictions on it:

http://windows.microsoft.com/en-us/windows7/change-create-or-delete-a-power-plan-scheme

Follow the steps and make certain that your connected or plugged in power scheme isn't using greater energy savings settings than your battery power scheme.

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