Tpm Interrupt Not Working Ubuntu Dell

TPM Interrupt Not Working, Polling Instead When Booting from Bootable USB

Introduction

When attempting to boot from a bootable USB, you may encounter an issue where the TPM (Trusted Platform Module) interrupt is not working, and polling is used instead. This issue is particularly prevalent on Dell systems.

Causes

The root cause of this issue is an Ubuntu update that searches for a TPM chipset. This update triggers a bug that prevents the TPM from using interrupts and forces it to revert to polling mode.

Solution

Fortunately, this issue can be resolved with a simple command-line option. To disable TPM interrupts and force polling mode, use the following command when booting from the USB: ``` tpm_tis.interrupts=0 ```

Impact

While this solution effectively resolves the TPM interrupt issue, it's important to note that it is not officially supported by Dell. Additionally, using polling mode may result in slightly reduced performance compared to interrupt mode. However, for the purpose of installing Ubuntu, this solution is sufficient.

Conclusion

If you are experiencing the TPM interrupt not working issue when booting from a bootable USB, using the "tpm_tis.interrupts=0" command-line option will disable TPM interrupts and force polling mode. This workaround will allow you to successfully install Ubuntu on your Dell system without encountering the interrupt issue.