linux-kernel - "ACPI: EC: missing confirmations, switch off interrupt mode" wastes time on startup

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Message-ID: <4e5e476b0903260847m1de3e976ne20279df359176cf@mail.gmail.com>
Date:	Thu, 26 Mar 2009 16:47:20 +0100
From:	Corrado Zoccolo <czoccolo@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: "ACPI: EC: missing confirmations, switch off interrupt mode" wastes 
	time on startup

Hi,
I found that on my netbook (acer aspire one 110), kernel boot time
(kernel 2.6.29) is severely affected by the EC boot procedure, since
it is first fooled by a spurious interrupt in thinking that interrupts
work, and then gets a timeout waiting for an interrupt that never
arrives:
[    0.351161] calling  acpi_init+0x0/0x236 @ 1
[    0.361052] ACPI: EC: Look up EC in DSDT
[    0.367754] ACPI: BIOS _OSI(Linux) query ignored
[    0.368984] ACPI: EC: non-query interrupt received, switching to
interrupt mode
[    0.860013] ACPI: EC: missing confirmations, switch off interrupt mode.
[    0.866062] ACPI: Interpreter enabled

There is a bug report for this issue
http://bugzilla.kernel.org/show_bug.cgi?id=12001 ,  marked as fixed on
an old kernel, but I'm still getting it with 2.6.29 (maybe my
controller is flaky?), so I'm looking for a workaround: is there a way
to force the ACPI using polling?

-- 
__________________________________________________________________________

dott. Corrado Zoccolo                          mailto:czoccolo@...il.com
PhD - Department of Computer Science - University of Pisa, Italy
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