Comment 10 for bug 1762672

Before installing proposed kernel:

admin@1234567:~$ uname -a
Linux 1234567 4.15.0-1031-oem #36-Ubuntu SMP Mon Jan 7 09:40:58 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

admin@1234567:~$ dmesg | grep -i tpm
[ 0.000000] ACPI: TPM2 0x0000000076D60D78 000034 (v03 Tpm2Tabl 00000001 AMI 00000000)
[ 2.438389] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 4)
[ 2.449920] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 2.482185] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 2.534448] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 2.626704] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 2.798961] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 3.131219] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 3.783485] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 5.064239] tpm tpm0: TPM self test failed
[ 5.121846] ima: No TPM chip found, activating TPM-bypass! (rc=-19)

→ Checkbox TPM2-related tests fail.

Install proposed kernel:

admin@1234567:~$ uname -a
Linux 1234567 4.15.0-47-generic #50~tpm.1 SMP Wed Feb 13 15:53:50 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
admin@1234567:~$ dmesg | grep -i tpm
[ 0.000000] Linux version 4.15.0-47-generic (tyhicks@kathleen) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #50~tpm.1 SMP Wed Feb 13 15:53:50 UTC 2019 (Ubuntu 4.15.0-47.50~tpm.1-generic 4.15.18)
[ 0.000000] ACPI: TPM2 0x0000000076D60D78 000034 (v03 Tpm2Tabl 00000001 AMI 00000000)
[ 2.454686] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 4)
[ 2.466218] tpm tpm0: A TPM error (2314) occurred attempting the self test
[ 19.908470] CPU: 0 PID: 451 Comm: systemd-udevd Not tainted 4.15.0-47-generic #50~tpm.1

→ Checkbox TPM2-related tests pass.

I've tried cold-booting and re-running Checkbox tests 10 times, and I got the same passed results 10 times.