PCC (Platform Communication Channel) is a recent ACPI 5.0 addition. The driver does not find a PCC communications mailbox and just exits with that error message. It is not something to worry about, most machines don't have an ACPI PCCT table and they don't use this mechanism.
References: ACPI specification Chapter 14.0 "Platform Communications Channel" Linux source: drivers/mailbox/pcc.c -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1430625 Title: ACPI PCC probe failed. To manage notifications about this bug go to: https://bugs.launchpad.net/hundredpapercuts/+bug/1430625/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
