linux-kernel - Re: boot failure on i7-3317u in Samsung 900x3c

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Date:	Mon, 8 Oct 2012 21:17:27 +0600
From:	Mike Bakhterev <mike.bakhterev@...il.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-efi <linux-efi@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Tony Luck <tony.luck@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: boot failure on i7-3317u in Samsung 900x3c

On Mon, Oct 8, 2012 at 4:09 PM, Matt Fleming <matt@...sole-pimps.org> wrote:
>
> We've seen things like this before on Samsung laptops,
>
>         https://bugzilla.kernel.org/show_bug.cgi?id=47121
>
> We attributed it to a buggy UEFI implementation.
>

Thanks for the link. But what kind of bug this could be? And could it
be worked around? How can i help?

> So both Windows 7 and 8 boot successfully on your new laptop, but every
> OS failed with the *same* MCE error on your first? That is interesting.
>

No. Windows-es didn't report any errors. The machine just broke
someday when Windows 8 booted. Different Linux kernels fail with the
same MCE. The same MCE rises sometimes (frequently, but not always)
when i'm trying to write something to /sys entry for keyboard
backlight or to rfkill bluetooth phy.

> Does anyone have a clue how to diagnose this further? I still think it's
> a buggy UEFI implementation, especially since it ships with a CSM. Is it
> possible that these MCE errors are non-fatal on Win 7/8?
>

Are there any info on how to decode this MCE code? It is not covered
in Intel's manuals. Hard to reason without any knowledge.

- MB, respectfully
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