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[Bug 1524930] Re: "ACPI PCC probe failed" message is an error message when it should be debug
** Also affects: linux (Ubuntu Vivid)
** Changed in: linux (Ubuntu Vivid)
Status: New => Fix Committed
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"ACPI PCC probe failed" message is an error message when it should be
Status in linux package in Ubuntu:
Status in linux source package in Vivid:
Users of Ubuntu Vivid are seeing a seemingly alarming kernel failure
message "ACPI PCC probe failed" when in fact it is just a debug
message informing the kernel developers that a probe for an ACPI PCC
mailbox was not successful (which is just a debug only message) and
not a failure one needs to worry about. This message is asked about
frequently on askubuntu.com, so it is alarming quite a few users, c.f.
This fix landed in Wily, and the driver with the alarming message only
Upstream commit efd756daf4ddae3cec2404c4e0b680b7cfdd6a45 ("ACPI / PCC: Use pr_debug() for debug messages in pcc_init()")
Boot a machine without the PCC feature, without the fix one sees the
error message in the kernel log. With the fix, this error is now a
warning. Note: This only affects Vivid.
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