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XPS 13 (2015) i7 CPU Speed (again)

I currently have a i7 XPS 13 (2015) and I am noticing an odd issue where if I put the computer into sleep mode, then unplug it and then resume sleep, my processor is limited to 0.48 GHz.  

When I plug it back in, it resumes being able to go up to 2.9 GHz. 

I have the power profile set to high performance and if I just unplug the laptop while on it will not limit itself to 0.48 GHz.  This only happens after resume from sleep.  Rebooting the laptop fixes the issue.

I have already tried the Config TDP Level fix as suggested and I thought it had solved my problem, but it turns out I'm still seeing the same behavior.  Any ideas?

-David

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RE: XPS 13 (2015) i7 CPU Speed (again)

Did you set both plugged in and on battery to 2.9GHz?

-Brandon


Forum Member Since 2010
I, like others, am a forum member and not an employee of Dell

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RE: XPS 13 (2015) i7 CPU Speed (again)

are u sure the speed is limited, or is it just slowing itself down for a while?

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RE: XPS 13 (2015) i7 CPU Speed (again)

Yeah, it is definitely capped at 0.48.  It says the maximum speed is 2.39 GHz, but it will not go about 0.48 Ghz or above 20% utilization.

I have both plugged in and unplugged set to 15.0W @ 2.4 GHz.

If I plug it in and then immediately unplug it, things work as expected and it will go to 100% utilization.  It's only when the computer comes out of sleep mode.

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RE: XPS 13 (2015) i7 CPU Speed (again)

After a bit more testing, the processor limiting appears to happen only when the computer is put into sleep mode when plugged in.  If I sleep the computer while on battery and the resume, it does not exhibit this behavior.  

It's 100% repeatable on my machine, at the very least.

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RE: XPS 13 (2015) i7 CPU Speed (again)

I believe I have fully figured out the problem.  I am connecting the computer through the Dell Power Companion PW7015M.   The computer sees the PW7015M as a 35W adapter (I got the warning message after flashing BIOS A01).  

If I do not use the Dell Power Companion, everything works great and the processor performs as expected at all times.

With the Dell Power Companion connected, if I sleep the computer when it is plugged in, and then resume it on battery, the computer will limit itself to 0.48 GHz, and 20% utilization.  This can be remedied by plugging the computer back in.

I can reproduce this behavior 100% of the time and I'm wondering if others with the Dell Power Companion are seeing the same issue.  At the moment, I would consider this a minor annoyance since now I fully understand what is causing the issue, but in general, it seems like this should not be happening.

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RE: XPS 13 (2015) i7 CPU Speed (again)

this a box u can get to in advanced power options. ur solution may be in there. might have to experiment a little. but u cannot hurt anything by experimenting.

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RE: XPS 13 (2015) i7 CPU Speed (again)

Yes look at maximum power state as well. Dell probably tweaked a ton of setting to squeeze out their battery numbers.

-Brandon


Forum Member Since 2010
I, like others, am a forum member and not an employee of Dell

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RE: XPS 13 (2015) i7 CPU Speed (again)

same problem with i5 version ,cpu caps on 0.77 in performance mod ,0.57 in power saving mode and some times even a restart will not solve it .the new xps is not reliable ,i'm learning programing and i need a reliable laptop ,i'm really disapointed on new xps 13 ,macbooks  are much better in reliability .

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RE: XPS 13 (2015) i7 CPU Speed (again)

XPS 13 is very reliable, there are just a few settings that need to be corrected. All of these issues can be fixed, either by BIOS or by the user. It's a matter of us trying to resolve the issue first, and if we can't on our end then Dell will look into it on their end to try and fix it.

-Brandon


Forum Member Since 2010
I, like others, am a forum member and not an employee of Dell

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