linux-kernel - Re: Desktop PC freezes after showing many times the lines "AMD-Vi: Completion-Wait loop timed out" and "BUG: soft lockup

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Message-ID: <20140701134415.GA5438@pd.tnic>
Date:	Tue, 1 Jul 2014 15:44:15 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Kelvin Gonzalez <kelvin.gonzalezvivas@...il.com>
Cc:	'Jörg Rödel' <joro@...tes.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Desktop PC freezes after showing many times the lines "AMD-Vi:
 Completion-Wait loop timed out" and "BUG: soft lockup - CPU#2 stuck for
 23s!"

Hi Kelvin,

On Tue, Jul 01, 2014 at 03:30:59PM +0200, Kelvin Gonzalez wrote:
> Thank you Joerg and Borislav,

sure, np.

Btw, please do not top-post when replying to that thread.

> There is no BIOS Update available for this Mother Board. It has the most
> recent from Jan 2014. And I didn't find any option available in the BIOS
> Menu to disable the IOMMU.
> 
> I tried yesterday a fresh install passing the 'amd_iommu=off' to the kernel
> and everything is working fine. No delays/hangs, etc. The workaround works
> just perfect.

Well, this disables the IOMMU on your machine and it works perfectly
because you're simply not using it anymore. :-)

If you get a BIOS update at some point and/or want to complain to the
board manufacturer to give you a BIOS update and to fix the IOMMU setup,
you could try to enable it again (i.e., remove the cmdline option) and
report back to us.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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