From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: Re: [PATCH] intel_idle: PCI quirk to prevent Lenovo Ideapad s10-3 boot hang Date: Mon, 27 Sep 2010 14:57:35 +0100 Message-ID: <20100927135735.GA856@srcf.ucam.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-pci-owner@vger.kernel.org To: Len Brown Cc: Linux Power Management List , linux-pci@vger.kernel.org, Linux Kernel Mailing List List-Id: linux-pm@vger.kernel.org On Fri, Sep 24, 2010 at 09:26:31PM -0400, Len Brown wrote: > From: Len Brown > > 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@srcf.ucam.org