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Summary: shpchp: acpi_shpchprm:\_SB_.PCI0 evaluate _BBN fail=0x5 - HP xw8400


https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=174893


[EMAIL PROTECTED] changed:

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------- Additional Comments From [EMAIL PROTECTED]  2006-01-24 14:02 EST -------
The error messages are coming from the SHPC hotplug driver complaining about a 
missing ACPI _BBN method. This method tells it the starting bus number under a 
root bridge. The BIOS on these systems is likely not creating the _BBN method 
since there is a single root bridge in the system, in which case the bus 
number may be assumed to start from 0. 

Are these systems expected to support SHPC hotplug? If no, the messages can be 
ignored since the system doesn't support this capability anyway. If yes, there 
are 2 fix options: 1) have the BIOS create the _BBN method under the root 
bridge 2) make shpchp assume that a missing _BBN implies bus numbering starts 
at 0 (untested patch attached). This patch will break on systems that have 
multiple root bridges or on systems where bus number does not start at 0, but 
such systems are already at risk because the ACPI root bridge driver also 
assumes the same thing.

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