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Dasharo Performance: Custom fan curve

Test cases common documentation

Test setup

  1. Proceed with the Generic test setup: firmware.
  2. Proceed with the Generic test setup: OS installer.
  3. Proceed with the Generic test setup: OS installation.
  4. Proceed with the Generic test setup: OS boot from disk.

CFC001.001 Custom fan curve silent profile measure (Ubuntu 22.04)

Test description

The fan has been configured to follow a custom curve. This test aims to verify that the fan curve is configured correctly in silent profile and the fan spins up and down according to the defined values.

Test configuration data

  1. FIRMWARE = Dasharo

Test setup

  1. Proceed with the Test cases common documentation section.
  2. Install stress-ng on the DUT.

Test steps

  1. Power on the DUT.
  2. While the DUT is booting, hold the BIOS_SETUP_KEY to enter the UEFI Setup Menu.
  3. Enter the Dasharo System Features menu using the arrow keys and Enter.
  4. Enter the Power Management Options submenu.
  5. Verify that the Fan profile field is set to Silent - if not, using the arrow keys and Enter, choose the Silent option.
  6. Press F10 to save the changes.
  7. If necessary - press Y to confirm saving the changes.
  8. Go back to the main menu using the ESC key.
  9. Select the Reset option to apply the settings and reboot.
  10. Boot into the system.
  11. Log into the system by using the proper login and password.

  12. Open the terminal window and run the following command:

    stress-ng --cpu 16 --timeout 30m

  13. Open the terminal window and run the following command to get the temperature:

    cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/17761776:00/hwmon/hwmon3/temp1_input

    The last three digits of the output are the value of the number after the decimal point. Example output 47000 means 47°C.

  14. In the terminal window run the following command to get the PWM value of the CPU fan:

    cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/17761776:00/hwmon/hwmon3/pwm1

  15. Repeat steps 13-14 a couple of times.

  16. Note the results.

Expected result

Silent fan profile

Keep in mind that the EC firmware is smoothing, i.e. the fans will enter the target speed with a delay.

The algorithm by which the EC calculates the speed is as follows:

  • If the temperature is below the first one defined in the curve, set the speed to 0.
  • If the temperature is above the last defined curve, set the maximum speed.
  • If the temperature is equal to one of the temperatures of the points on the curve, set the speed from that point on the curve

  • If the temperature is between points on the curve:

    slope = (right_point_speed - left_point_speed)/right_point_temperature - left_point_temperature)
speed = slope*(temperature - left_point_temperature) + left_point_speed

Divide the PWM value by 2.55 to get the percentage to compare.

Example check for 30°C and 70 PWM values:

```text
expected_speed = ((30-25)/(65-0))*(30-0)+25 ≈ 27
actual_speed = 70/2.55 ≈ 27
```

Values expected_speed and actual_speed are strongly similar. This means that the fan control is set correctly.

CFC002.001 Custom fan curve performance profile measure (Ubuntu 22.04)

Test description

The fan has been configured to follow a custom curve. This test aims to verify that the fan curve is configured correctly in the performance profile and the fan spins up and down according to the defined values.

Test configuration data

  1. FIRMWARE = Dasharo

Test setup

  1. Proceed with the Test cases common documentation section.
  2. Install stress-ng on the DUT.

Test steps

  1. Power on the DUT.
  2. While the DUT is booting, hold the BIOS_SETUP_KEY to enter the UEFI Setup Menu.
  3. Enter the Dasharo System Features menu using the arrow keys and Enter.
  4. Enter the Power Management Options submenu.
  5. Verify that the Fan profile field is set to Performance - if not, using the arrow keys and Enter, choose the Performance option.
  6. Press F10 to save the changes.
  7. If necessary - press Y to confirm saving the changes.
  8. Go back to the main menu using the ESC key.
  9. Select the Reset option to apply the settings and reboot.
  10. Boot into the system.
  11. Log into the system by using the proper login and password.

  12. Open the terminal window and run the following command:

    stress-ng --cpu 16 --timeout 30m

  13. Open the terminal window and run the following command to get the temperature:

    cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/17761776:00/hwmon/hwmon3/temp1_input

    The last three digits of the output are the value of the number after the decimal point. Example output 47000 means 47°C.

  14. In the terminal window run the following command to get the PWM value of the CPU fan:

    cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/17761776:00/hwmon/hwmon3/pwm1

  15. Repeat steps 13-14 a couple of times.

  16. Note the results.

Expected result

Performance fan profile

Keep in mind that the EC firmware is smoothing, i.e. the fans will enter the target speed with a delay.

The algorithm by which the EC calculates the speed is as follows:

  • If the temperature is below the first one defined in the curve, set the speed to 0.
  • If the temperature is above the last defined curve, set the maximum speed.
  • If the temperature is equal to one of the temperatures of the points on the curve, set the speed from that point on the curve

  • If the temperature is between points on the curve:

    slope = (right_point_speed - left_point_speed)/right_point_temperature - left_point_temperature)
speed = slope*(temperature - left_point_temperature) + left_point_speed

Divide the PWM value by 2.55 to get the percentage to compare.

Example check for 30°C and 79 PWM values:

```text
expected_speed = ((35-25)/(55-0))*(35-0)+25 ≈ 31
actual_speed = 79/2.55 ≈ 31
```

Values expected_speed and actual_speed are strongly similar. This means that the fan control is set correctly.