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I am using a Dual-boot laptop (Windows10 and Ubuntu18.04 LTS), and I am trying to using the Intel RAPL interface for power measurement in Ubuntu. When I want to use sudo modprobe intel_rapl_common to load the kernel module, the error messages returns "No such device". Also, the following two folders "/sys/devices/virtual/powercap/" and "/sys/class/powercap/" are empty which should be the place where intel_rapl is located. To the best of my knowledge, RAPL has been integrated into Intel's Sandy Bridge and I have seen power measurement on 11th i7, can anyone help with this issue?

Additional information:

  1. tried sudo depmod then modprobe, same error.

  2. uname -r: 5.4.0-107-generic

  3. find /lib/modules/$(uname -r) -name *rapl* output:

/lib/modules/5.4.0-107-generic/kernel/arch/x86/events/rapl.ko
/lib/modules/5.4.0-107-generic/kernel/drivers/powercap/intel_rapl_msr.ko
/lib/modules/5.4.0-107-generic/kernel/drivers/powercap/intel_rapl_common.ko```
Wangkai Jin
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  • As far as I know, the modules load by default. do you get any insight from sudo dmesg | grep -i rapl? – Doug Smythies Apr 11 '22 at 14:22
  • There is no rapl detected. I wonder whether this is issue is related in the folowing: When I open Software & Update -> Additional Driver, the GUI displayes Intel Corporation Unknown -> Do no use this device (in gray text). I searched online but it seems to be a wifi driver issue (though my wifi connection is fine), but not related to RAPL. – Wangkai Jin Apr 12 '22 at 13:40
  • With a 10th gen Intel processor, and for a different reason, I found the 5.4 series kernel was not new enough, and had to go to HWE on my 20.04 test server. – Doug Smythies Apr 12 '22 at 13:56

1 Answers1

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After upgrading kernel to 5.6, the issue is solved.

Nonny Moose
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Wangkai Jin
  • 83