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Date: Tue, 28 Nov 2017 09:14:40 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Zhang Rui <rui.zhang@intel.com>
Cc: LKML <linux-kernel@vger.kernel.org>, linux-x86 <x86@kernel.org>,
        tglx@linutronix.de, Len Brown <len.brown@intel.com>,
        "Chen, Yu C" <yu.c.chen@intel.com>
Subject: Re: Regression: unable to boot after commit bd9240a18edf ("x86/apic:
 Add TSC_DEADLINE quirk due to errata") - Surface Pro 4 SKL
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References: <1511834933.2498.14.camel@intel.com>
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On Tue, Nov 28, 2017 at 10:08:53AM +0800, Zhang Rui wrote:
> Hi, All,
> 
> My Surface Pro 4 is unable to boot after 4.12. The symptom is that
> kernel freezes during boot, and the last message in the screen is
> loading the initrd image. And I have bisected it to this commit

> +//	DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_SKYLAKE_MOBILE,	0xb2),

And what microcode version do you run? Have you installed the latest
microcode package and updated your initrd to include it? My skylake is
running 0xba.