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Date: Fri, 7 May 2004 13:07:56 +0200
From: Alex Riesen <fork0@users.sf.net>
To: linux-kernel@vger.kernel.org
Cc: Bob Gill <gillb4@telusplanet.net>, Len Brown <len.brown@intel.com>
Subject: Re: hdc: lost interrupt ide-cd: cmd 0x3 timed out ...
Message-ID: <20040507110756.GA4647@linux-ari.internal>
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>> zero IDE changes in bk6 -> bk8 but a lot of ACPI / IRQ related

it's bk8 which broke sis961 (or revealed it native brokenness)

> OK.  My APIC is a SiS961.

I have the same problem (and the same chipset).
Passing acpi=noirq helps to work it around.