Re: Regression: unable to boot after commit bd9240a18edf ("x86/apic: Add TSC_DEADLINE quirk due to errata") - Surface Pro 4 SKL

[Zhang Rui]

On Tue, 2017-11-28 at 09:14 +0100, Peter Zijlstra wrote:
> 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.

No, I didn't upgrade my microcode.

$ cat /proc/cpuinfo
...
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 78
model name	: Intel(R) Core(TM) i7-6650U CPU @ 2.20GHz
stepping	: 3
microcode	: 0x9e
...

I suppose the problem should be gone if I upgrade the microcode.
But the real problem to me is that the system FREEZES after kernel
upgrade.

thanks,
rui