linux-kernel - Re: Dell XPS13: MCE (Hardware Error) reported

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Date:   Thu, 5 Jan 2017 21:03:10 +0000
From:   "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
To:     "Raj, Ashok" <ashok.raj@...el.com>, "bp@...e.de" <bp@...e.de>
CC:     "Brown, Len" <len.brown@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Luck, Tony" <tony.luck@...el.com>,
        "linux@...mhuis.info" <linux@...mhuis.info>,
        "pmenzel@...gen.mpg.de" <pmenzel@...gen.mpg.de>,
        "alexander@...mayhu.com" <alexander@...mayhu.com>,
        "daniel@...ra.org" <daniel@...ra.org>
Subject: Re: Dell XPS13: MCE (Hardware Error) reported

On Thu, 2017-01-05 at 12:43 -0800, Raj, Ashok wrote:
> Hi Boris
> 
> 
> On Thu, Jan 05, 2017 at 09:31:47PM +0100, Borislav Petkov wrote:
> > 
> > On Thu, Jan 05, 2017 at 09:10:34PM +0100, Alexander Alemayhu wrote:
> > > 
> > > Not sure if it is related, but I am also seeing those messages on
> > > my
> > > MacBookPro11,3:
> > 
> > Yours look to me like thermal throttling MCEs. And TBH we whould
> > not issue those as actual MCEs because they are not - they *signal*
> > overheating condition only and should be handled differently.
> 
> That's right.. the thermal interrupts are being reported, that should
> have
> started running cpu's at lower frequencies via some thermald. 
> If that's not handled and the PCU starts enforcing trying to keep the
> temps 
> under control system starts logging MCE's. 
> 
> Ccing Srinivas who might be able to give a better pointer to check
> why 
> that's not happening.
I suggest trying with the following kernel command line, if your
getting notification to throttle from SMM before:

	intel_pstate=support_acpi_ppc

opensuse doesn't start thermald by default.

Thanks,
Srinivas