Ubuntu Tpm Interrupt Not Working Polling Instead

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TPM Interrupt Not Working: Polling Instead on Ubuntu 2204

Issue:

Users who have installed Ubuntu 2204 on their Acer C720 Chromebook may encounter an issue where the TPM interrupt is not working, resulting in the system polling instead.

Symptoms:

* Difficulty booting from a bootable USB * Windows freezing during "Preparing Automatic Repair" * Ubuntu displaying a black screen

Cause:

The issue arises because the TPM on the Acer C720 Chromebook does not support interrupts.

Solution:

To resolve this issue, a command line option must be applied to force the TPM to disable interrupts and go back to polling mode.

Here are the steps:

1. Press "e" during boot to edit the boot options. 2. Find the line that starts with "linux /boot/vmlinuz-5.15.0-47-generic." 3. Add "tpm_tis.force=1" to the end of the line. 4. Press Ctrl+X to boot with the modified options.

Recovery:

If the above solution does not work, it may be necessary to recover the system: * Create a bootable USB drive with Ubuntu 2204. * Boot from the USB drive and select "Try Ubuntu." * Navigate to "Applications" > "Utilities" > "Disks." * Select the internal drive and click on the "Restore" tab. * Follow the prompts to restore the system.

Conclusion:

By applying the command line option, users can resolve the issue of TPM interrupt not working and successfully boot their Acer C720 Chromebook with Ubuntu 2204. ```