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nonZero

Member

Registered: 2015-05-17

Posts: 69

Dell Latitude 5511 Laptop drops CPU frequency to 800 MHz

My Dell Latitude 5511 Laptop keeps dropping to 800 MHz, even if the temperature is low.
The governor is "peformance" and whatever I do, it keeps dropping to a low frequency.

# cpupower frequency-info 
analyzing CPU 0:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency:  Cannot determine or is not supported.
  hardware limits: 800 MHz - 5.10 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 3.00 GHz and 5.10 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 4.39 GHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes

I didn't find anything suspicious in journalctl - but I am not sure what to look for.

1. How can I log/follow/trace WHY the frequency drops?
2. How can I make it stop happening?

Any advice would be helpful!

Last edited by nonZero (2022-03-30 15:03:27)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,209

Re: Dell Latitude 5511 Laptop drops CPU frequency to 800 MHz

Dells tend to do that, look for a firmware update. One method to fix this used to/can be to completely shutdown and unplug the system and take the battery out for a few secs.

nonZero

Member

Registered: 2015-05-17

Posts: 69

Re: Dell Latitude 5511 Laptop drops CPU frequency to 800 MHz

Dells tend to do that, look for a firmware update. One method to fix this used to/can be to completely shutdown and unplug the system and take the battery out for a few secs.

Thanks for the lead!

Some probably relevant links:
https://www.dell.com/community/Latitude … 483/page/4

nonZero

Member

Registered: 2015-05-17

Posts: 69

Re: Dell Latitude 5511 Laptop drops CPU frequency to 800 MHz

More Info: I am using a Dell WD19 180W docking station.