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BlackMiracle
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Dell Latitude E7440 CPU speed capped after sleep

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My Dell Latitude E7440 laptop came with Windows 8.1 at the time I bought it. I did not notice this problem until I upgraded to Windows 10.

Sometimes when I put the laptop to sleep and resuming at a later time, the CPU speed is limited to around 0.78 GHz and switching to High Performance mode won't help. The computer becomes very slow and the only way to fix it is rebooting.

I have the latest BIOS installed (A15) and other drivers are also updated.

I have seen other threads saying that the problem is caused from using Dell Power Companion but I am not using it. I have 2 power adapters that I use with this laptop, one of them is a Dell 90W adapter. I am not sure about the other one as I do not have it right now, but that one originally came with the laptop.

Any temporary/permanent fix for this? Thank you.

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16 Replies
sschluet
1 Copper

RE: Dell Latitude E7440 CPU speed capped after sleep

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Hello. Unfortunately i have no solution but i can report the exact same behaviour.

I have also an E7440 with latest firmware version and Windows 10 (with latest updates).

Do you have any new information or workaround for the problem?

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d97ulf
1 Copper

RE: Dell Latitude E7440 CPU speed capped after sleep

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My Latitude E7440 also have a very similar issue after sleep after I upgraded to Windows 10.

In my case it works when I plug in the AC adapter, but when switching to battery I can never get above 0.98 GHz even if I adjust the power plans. Rebooting the computer resolves the issue.

I do not have Dell Power Companion installed either.

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tam100
1 Copper

RE: Dell Latitude E7440 CPU speed capped after sleep

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Can't offer a fix, but can say I have exactly the same issue.

Suspect others do too, very frustrating! 

Would happen with 8.1pro for me too, upgraded to 10 as a new build in case it was software related, but still the same issue.

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Konradzio
1 Copper

RE: Dell Latitude E7440 CPU speed capped after sleep

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I hade the same problem on Win 8.1 Pro, i7-4600U CPU version.

Only reboot fix problem.

:-(

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horacek
1 Copper

RE: Dell Latitude E7440 CPU speed capped after sleep

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Same here - 0.78 Ghz stuck when NTB woke up on battery. Restart or plugin to power fix it. Please FIX IT

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lumens
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RE: Dell Latitude E7440 CPU speed capped after sleep

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I'm facing exactly the same problem.

Bios A15, i7-4600U, Windows 8.1 x64, both with and without Power Companion

Restart fixes it.


Did anyone try to resolve this with the newer A16 bios? I tried A16 for a while but it seems that it kills the card reader (had to downgrade to A15 to get it back).

This is not a cheap laptop. It should not have these kind of issues.

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Konradzio316
1 Copper

RE: Dell Latitude E7440 CPU speed capped after sleep

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I've solved this problem. Downgrade BIOS to A01 and update step by step every single newer version - A01>A02>A03 ... >A15. Now, I'm on BIOS A15 and there is no problem with CPU after suspend. i7-4600u, W8.1 x64.

BlackMiracle
1 Nickel

RE: Dell Latitude E7440 CPU speed capped after sleep

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I've solved this problem. Downgrade BIOS to A01 and update step by step every single newer version - A01>A02>A03 ... >A15. Now, I'm on BIOS A15 and there is no problem with CPU after suspend. i7-4600u, W8.1 x64.

Where did you download BIOS version A02, A06, A09 and A11 ?

On Dell E7440 support page, those 4 versions are missing. Here : https://www.dell.com/support/home/us/en/19/Drivers/DriversDetails?driverId=17KP5&fileId=3493406432&o...

Do you think I can just skip them? (And now A16 is out)

Thanks.

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tam100
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RE: Dell Latitude E7440 CPU speed capped after sleep

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Thank you Konradzio316


I too had this issue, I had already updated to A16 which did not resolve it, therefore followed Konradzio316 suggestion.

I downloaded all the available BIOS versions from the support site (a few were missing so just skipped them), then installed A01 and each available version in order all the way back to A16 and the problem is resolved!

So looks like some sort of BIOS issue was causing the CPU to be speed limited to 0.78Ghz or similar speeds until you rebooted - not any more though its now all good again.


Tam

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