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Date: Tue, 28 Nov 2017 13:36:07 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Zhang Rui <rui.zhang@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>, linux-x86 <x86@kernel.org>,
        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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On Tue, Nov 28, 2017 at 06:59:01PM +0800, Zhang Rui wrote:
> > > > > My Surface Pro 4 is unable to boot after 4.12. The symptom is

> yes. Tried 4.4 distro and 4.12 vanilla kernel, kernel always freezes
> with boot option "notscdeadline"/"lapic=notscdeadline".

Then for some mysterious reason, your Surface thing has a borked LAPIC.

No idea how or why..