“tpm_tis: A TPM error (6) occurred attempting to read a pcr value”.
Information about TPMhttps://wiki.archlinux.org/index.php/TPM
If you not need TPM, just
echo blacklist tpm_tis > /etc/modprobe.d/tpm_tis.conf (need root)
It worked on my computer. The error gone.

$sudo vim /etc/modprobe.d/tpm_tis.conf

Enter the following: blacklist tpm_tis

Additional options:

just activate the security chip in the bios, that should work, too. similar to whatRikTwrote, on my thinkpad the error message was gone after i enabled the security chip in the bios, changing it frominactivetoactive. so it seems you can get rid of the error message by either activating or disabling the security chip.