linux-kernel - 2.6.35-rc3 regression: IBM Maia system is unbootable [ACPI related?]

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Date:	Mon, 21 Jun 2010 11:03:09 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: 2.6.35-rc3 regression: IBM Maia system is unbootable [ACPI
 related?]

The system in question has a set of root bridges, with the CD rom (which
is seen) being on bus 0 and the SCSI controller, which doesn't show up
being on bus 1 (with several other things on busses > 1).

The system uses ACPI to detect the multiple bridges, so it seems that
this failure in 2.6.35-rc3:

ACPI: Core revision 20100428
ACPI Error: Hardware did not enter ACPI mode (20100428/evxfevnt-103)
ACPI Warning: AcpiEnable failed (20100428/utxface-147)
ACPI: Unable to enable ACPI

Means that we can't detect any PCI bus other than 0 and thus the system
won't boot.

The full dmesgs for a successful (2.6.34) and failed (2.6.35-rc3) boot
are below.

James

View attachment "dmesg.2.6.34" of type "text/plain" (121666 bytes)

View attachment "dmesg.2.6.35-rc3" of type "text/plain" (70985 bytes)