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Date: Sun, 13 May 2012 09:39:31 +0100
From: Bruce Cran <bruce@cran.org.uk>
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Subject: ACPI 'driver bug: Unable to set devclass'
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I've just updated to -current and noticed the following errors in dmesg:

acpi0: <NEC > on motherboard
acpi0: Power Button (fixed)
acpi0: reservation of fee00000, 1000 (3) failed
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, bbf00000 (3) failed
driver bug: Unable to set devclass (class: acpi_sysresource devname: 
(unknown))
driver bug: Unable to set devclass (class: acpi_timer devname: (unknown))
cpu0: <ACPI CPU> on acpi0
ACPI Warning: Incorrect checksum in table [OEMB] - 0x45, should be 0x44 
(20120420/tbutils-293)
driver bug: Unable to set devclass (class: acpi_sysresource devname: 
(unknown))
cpu2: <ACPI CPU> on acpi0
driver bug: Unable to set devclass (class: acpi_sysresource devname: 
(unknown))
cpu1: <ACPI CPU> on acpi0
driver bug: Unable to set devclass (class: acpi_sysresource devname: 
(unknown))

-- 
Bruce Cran