Arch Linux

usc

Member

Registered: 2020-12-06

Posts: 3

Stuck at 800Mhz until Suspend/Resume

i have a arch on a Dell Precision 7530 which is stuck at 800Mhz when doing a fresh boot. when i open a shell and do a watch grep \"cpu MHz\" /proc/cpuinfo i see every cpu at 800Mhz and not more. But when i do a suspend and a resume, all breaks are released!

my settings do not change. after a fresh boot and after the resume the settings are:

❯ uname -a
Linux usc-precision 5.9.12-arch1-1 #1 SMP PREEMPT Wed, 02 Dec 2020 16:14:56 +0000 x86_64 GNU/Linux

❯ LANG=en 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 - 4.80 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 800 MHz and 4.80 GHz.
         The governor "powersave" may decide which speed to use
         within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 830 MHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes

but as a said: doing a fresh boot, the upper limit (4.8GHz) does not work, everything stucks at 800Mhz although the output of "cpupower" looks like it should work.

so my workaround after a fresh boot is not to login but to do a suspend from the login screen. then resume and then login.

i'd like to know how to release the breaks without resuming. if it is a BIOS setting: why does this change after a resume?

i've also posted this problem at Reddit some time ago but no one had a solution.

a few days ago there was a new dell firmware release and i hoped it would be better but ... no.

it would be really great to know what the problem is. and how to solve it :-). or at least have a better workaround like a one-shot command which can be entered to "release the breaks". the only thing which works is to suspend/resume which is a little annoying.

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,231

Re: Stuck at 800Mhz until Suspend/Resume

Dells seem to be weirdly susceptible to this issue and the only fix I've seen floating around is to completely cut the power, including disconnecting the battery for a few seconds (... and updating your BIOS/UEFI)

Last edited by V1del (2020-12-10 16:18:13)

usc

Member

Registered: 2020-12-06

Posts: 3

Re: Stuck at 800Mhz until Suspend/Resume

for anyone reading this posting: the problem is fixed on my system since the kernel

❯ uname -a
Linux usc-precision 5.9.14-arch1-1 #1 SMP PREEMPT Sat, 12 Dec 2020 14:37:12 +0000 x86_64 GNU/Linux

was released. i did not have to do anything with the battery