Since upgrading from 13.10 to 14.04 (with do-release-upgrade) my computer (Sony vgn-sz1vp) hangs for 4 minutes when booting.

[    1.015598] tpm_tis 00:06: 1.2 TPM (device-id 0xB, rev-id 16)

[    1.019920] ACPI: Battery Slot [BAT1] (battery present)

[    1.321725] isapnp: No Plug & Play device found

[   93.668058] random: nonblocking pool is initialized

[  121.040029] tpm_tis 00:06: Operation Timed out

[  121.052385] tpm_tis 00:06: A TPM error (-62) occurred attempting to determine the timeouts

[  241.088029] tpm_tis 00:06: Operation Timed out

[  241.100484] tpm_tis 00:06: Could not get TPM timeouts and durations

So far I have tried:

• enabling and disabling TPM in the BIOS (no change)


• adding blacklist items for tpm_tis (and other TPM modules) in /etc/modprobe.d/blacklist-local.conf (no change)

Is there a boot parameter I can add to grub to tell the kernel to stop trying to communicate with the TPM hardware?