Apr 6 09:20:36 b12 kernel: [ 0.901010] ACPI Error: [\PST0] Namespace lookup failure, AE_NOT_FOUND (20120320/psargs-359) Apr 6 09:20:36 b12 kernel: [ 0.901012] ACPI Error: Method parse/execution failed [\_SB_.SCK0.CP0B._PPC] (Node ffff88042953b050) Launchpad report: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/967907
Created attachment 72830 [details] dmidecode
Created attachment 72831 [details] interrupts
Created attachment 72832 [details] lspci
Created attachment 72833 [details] kern.log
Please post the acpidump for the machine.
Created attachment 72840 [details] acpidump
Let me know if you need anything else.
There is no PST0 defined in any table. Seems a BIOS bug.