i am having the same issue on my DELL 7320 model.

bios was updated to the latest 12.0.1 and having the same issue. 

can anyone take into the issue? as totally unable to work on battery plus usb plugged in

Does the problem happen with you always when you unplug? Or only incidentally? Can you find a rhyme or reason in this?

For me, it was happening again. Unplugging the power from the hub dropped the 7320 down to 0.49GHz. Even after a powercycle. But now an hour later, when I try to unplug again, it just drops to ~1GHz. Which is actually still kinda bad...

I have similar issues with this machine, except for me, any USB device I plug in, throttles the CPU to 0.5Ghz on battery.

Dell support seem unable to find a solution and this is driving me nuts.

Hi,

try to update driver "Intel Innovation Framework".
Not from Dell site - look for current from Intel. This might fix the issue.

Do you have a link to this "Intel Innovation Framework"? Searching it on Google, or on https://www.intel.com/content/www/us/en/search.html?#q=intel%20innovation%20framework&sort=relevancy&f:@tabfilter=[Downloads] doesn't give any hits.

Searching for it with https://www.google.com/search?q=%22intel+innovation+platform+framework%22 gives downloads on Dell, HP, Lenovo, etc. but not on Intel.

Here is a HWInfo64 sensor log when the problem occurs: https://gist.github.com/erik-smit/117ea76439db4fd32d5552abd95d183f

At 11:00:41 it starts connected to power from the dock.
At 11:00:48 I remove it from the dock.
At 11:01:36 I plug in a USB-C to A dongle.
At 11:02:43 I plug it back into the dock.

Noticable things are: GPU always clocks down to 100MHz. PROCHOT Asserts for 2 polling cycles after disconnecting dock. EDP asserts after disconnecting dock.

Unfortunatly, asside from the drop from 1.6GHz to 0.5GHz, no other sensors seem to change when plugging in the USB-C->A dongle.

ThrottleStop gives the same answer. When it's plugged in, the power limit is PL1. As soon as external power is lost, it's limited by "Electrical Design Point". Perhaps some internal power regulation stuff is either undersized or misconfigured?

Anybody have a clue if it's possible to look into this?

https://www.intel.com/content/www/us/en/support/articles/000039154/processors/intel-core-processors.html says that common reasons for EDP throttling are: IccMax too low, VR current too low, motherboard inadequate.

I'm having the same issue even with the power plan set to performance and SpeedStep turned off. I have the latest BIOS and all the latest Windows updates and drivers from Dell SupportAssist.

I could swear this wasn't happening when I first got it. Does anyone feel the same?

Today I tried booting Ubuntu from a USB flash drive connected to a hub. Even after plugging in another hub to the other USB-C port most of my cores were still running at over 2GHz. This is making me think it's a problem with Windows and I'm tempted to reinstall but I'm hoping someone might have an easier solution.

Had the same issue with Latitude 5400 (while on AC power) after bios update (V 1.25.0).

Workaround - Disabled Intel SpeedStep