Latitude 7420 throttled to 55C on Linux. Cant watch 4K videos.

Question

I cant watch 4K videos on my new Latitude 7420 with Ubuntu 20.04 because the CPU has a 55C limit for some reason? It's already set to Ultra Performance, however, the CPU almost never goes higher than 55C and when it does it immediately goes to 400Mhz. What I see here is that Dell is shipping Linux machines without proper configuration from the BIOS.

Dell if you are listening, please deliver a fix, I am thinking about just returning the laptop becauase I ordered the maxed out one with 32GB, and I cant even watch 4K videos..

Any Linux users experiencing this with the i7-1185G7?

ftsogr · Answer

I have the same problem with Latitude 5420, same OS and i7-1185G7.

ftsogr · Answer

Dear oisangui,

Did you find any solution?

Try run these commands:
1) sudo rmmod intel_rapl_msr processor_thermal_device processor_thermal_rapl intel_rapl_common intel_powerclamp
2) sudo modprobe intel_rapl_msr processor_thermal_device processor_thermal_rapl intel_rapl_common intel_powerclamp

The command (1) removes all the thermal related modules from the linux kernel.
The command (2) load them again.

Be careful, may you harm your laptop.
Always monitoring the CPU temperature with an applet.

I am still investigating for the best workaround...

ftsogr · Answer

Finally you should run the commands below one by one with this sequence after system boot up :

sudo rmmod intel_rapl_msr
sudo rmmod processor_thermal_device
sudo rmmod processor_thermal_rapl
sudo rmmod intel_rapl_common
sudo rmmod intel_powerclamp

sudo modprobe intel_powerclamp
sudo modprobe intel_rapl_common
sudo modprobe processor_thermal_rapl
sudo modprobe processor_thermal_device
sudo modprobe intel_rapl_msr

oisangui · Answer

dear ftsogr, I arrived to the same partial solution of disabling these modules, but it didn't occur to me to reenable them again. I will try that and check the results.

Another partial solution I found was the following:

-Go to Windows on dual boot.

-Reinstall intel dynamic thermal platform driver.

-Reboot and open Linux.

SebastianH · Answer

Same problem here:

Dell forums: https://www.dell.com/community/Latitude/Latitude-5420-7420-7520-CPU-Throttling-Issue-on-Linux/td-p/7959019
Github Thermald project: https://github.com/intel/thermal_daemon/issues/293
Github Throttled project: https://github.com/erpalma/throttled/issues/255

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Latitude 7420 throttled to 55C on Linux. Cant watch 4K videos.

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