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How To Fix “dell_smm_hwmon: unable to get SMM Dell signature” Error on Ubuntu 22.04

Ubuntu 15

If you’re using a Dell laptop with Ubuntu 22.04, you might encounter an error message during boot time that reads “dell_smm_hwmon: unable to get SMM Dell signature”. This error is typically associated with the Nvidia graphics driver and may also be related to temperature sensors controlled by the BIOS. In this article, we will guide you through the steps to resolve this error.

Quick Answer

To fix the "dell_smm_hwmon: unable to get SMM Dell signature" error on Ubuntu 22.04, you can try downgrading the Nvidia driver to nvidia-driver-515. This can potentially resolve the issue. However, if your system is functioning normally, it might be safe to ignore this error.

Understanding the Error

The error “dell_smm_hwmon: unable to get SMM Dell signature” is often seen on Dell Inc XPS 15 9520 laptops running Ubuntu 22.04. The issue seems to be associated with the nvidia-driver-525, which is used for the NVIDIA GeForce RTX 3050 Mobile graphics card.

This error message might be related to the System Management Mode (SMM), a special-purpose operating mode provided for handling system-wide functions like power management, system hardware control, or proprietary OEM designed code. It is suspected that the error arises when the system fails to get the SMM Dell signature, which is necessary for certain functions.

Possible Solution: Downgrade Nvidia Driver

One of the potential solutions to this problem is to downgrade the Nvidia driver to an older version, specifically nvidia-driver-515. Here’s how you can do it:

  1. Open your terminal. You can do this by pressing Ctrl + Alt + T.
  2. Uninstall the current Nvidia driver with the following command:
sudo apt-get remove nvidia-driver-525

In this command, sudo gives you superuser access, apt-get remove is used to remove a package, and nvidia-driver-525 is the package you want to remove.

  1. After the uninstallation is complete, you can install the older version of the Nvidia driver with the following command:
sudo apt-get install nvidia-driver-515

In this command, sudo gives you superuser access, apt-get install is used to install a package, and nvidia-driver-515 is the package you want to install.

  1. Reboot your system to ensure the changes take effect.

Ignoring the Error

It’s important to note that this error message may not necessarily indicate a critical issue. It may be related to temperature sensors controlled by the BIOS, and if you’re not experiencing any other issues with your system, it might be safe to ignore this error.

Conclusion

While the “dell_smm_hwmon: unable to get SMM Dell signature” error can be alarming, it’s not always indicative of a serious problem. Downgrading your Nvidia driver to nvidia-driver-515 can potentially resolve the issue. However, if your system is functioning normally, it might be safe to ignore this error.

As always, ensure that you back up any important data before making changes to your system drivers. If you’re ever in doubt, don’t hesitate to seek professional help or consult online Linux communities for further assistance.

How do I check the version of the Nvidia driver installed on my Ubuntu system?

You can check the version of the Nvidia driver installed on your Ubuntu system by opening a terminal and running the command nvidia-smi. This will display detailed information about the Nvidia driver, including the version number.

Can I downgrade the Nvidia driver to a version other than nvidia-driver-515?

Yes, you can choose to downgrade the Nvidia driver to a version other than nvidia-driver-515. However, it’s important to note that the solution provided in this article specifically recommends downgrading to nvidia-driver-515, as it has been reported to resolve the "dell_smm_hwmon: unable to get SMM Dell signature" error on Ubuntu 22.04. If you decide to downgrade to a different version, it’s recommended to research and ensure compatibility with your specific hardware and Ubuntu version.

How can I find out if my Dell laptop is affected by this error?

If you’re experiencing the "dell_smm_hwmon: unable to get SMM Dell signature" error during boot time on Ubuntu 22.04, and you have a Dell Inc XPS 15 9520 laptop with the Nvidia GeForce RTX 3050 Mobile graphics card, it’s likely that your system is affected by this error. However, it’s always a good idea to verify the specific error message and your hardware configuration to confirm if the issue is the same.

Is it safe to ignore the “dell_smm_hwmon: unable to get SMM Dell signature” error?

If your system is functioning normally and you’re not experiencing any other issues, it may be safe to ignore the "dell_smm_hwmon: unable to get SMM Dell signature" error. This error message is often related to temperature sensors controlled by the BIOS and may not indicate a critical problem. However, it’s always recommended to monitor your system’s performance and temperature to ensure there are no underlying issues.

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