linux-kernel - Re: [PATCH] intel_idle: PCI quirk to prevent Lenovo Ideapad s10-3 boot hang

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Message-ID: <20100927135735.GA856@srcf.ucam.org>
Date:	Mon, 27 Sep 2010 14:57:35 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Len Brown <lenb@...nel.org>
Cc:	Linux Power Management List <linux-pm@...ts.osdl.org>,
	linux-pci@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] intel_idle: PCI quirk to prevent Lenovo Ideapad s10-3
	boot hang

On Fri, Sep 24, 2010 at 09:26:31PM -0400, Len Brown wrote:
> From: Len Brown <len.brown@...el.com>
> 
> When the Lenovo Ideapad S10-3 is booted with HT enabled,
> it hits a boot hang in the intel_idle driver.
> 
> This occurs when entering ATM-C4 for the first time,
> unless BM_STS is first cleared.
> 
> acpi_idle doesn't see this because it first checks
> and clears BM_STS, but it would hit the same hang
> if that check were disabled.

If there's hardware that expects BM_STS to be cleared, and if we've 
previously always cleared BM_STS, shouldn't intel_idle be doing the same 
thing?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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