From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kai Krakow <hurikhan77@gmail.com>
Subject: Re: system freeze with kernel 3.2-rc7
Date: Mon, 26 Dec 2011 03:43:22 +0100
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References: <jisks8-sbv.ln1@hurikhan.ath.cx> <86sjk8gmu7.fsf@sumi.keithp.com>
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Keith Packard <keithp@keithp.com> schrieb:

> On Mon, 26 Dec 2011 01:43:37 +0100, Kai Krakow <hurikhan77@gmail.com>
> wrote:
> 
>> I didn't have such issues with early 3.2 rcs (afair), and not with 3.1
>> kernels. After some digging through google I've found you enabled RC6 in
>> 3.2. I disabled it now, and my system runs wonderfully.
> 
> Argh. Can you try building a kernel with VT-d support? I assume you
> can't turn VT-d off in the BIOS as it's UEFI?

kakra@jupiter ~ $ zgrep -i iommu /proc/config.gz 
CONFIG_GART_IOMMU=y
# CONFIG_CALGARY_IOMMU is not set
CONFIG_IOMMU_HELPER=y
CONFIG_IOMMU_API=y
CONFIG_IOMMU_SUPPORT=y
# CONFIG_AMD_IOMMU is not set
CONFIG_INTEL_IOMMU=y
CONFIG_INTEL_IOMMU_DEFAULT_ON=y
CONFIG_INTEL_IOMMU_FLOPPY_WA=y
# CONFIG_IOMMU_DEBUG is not set
# CONFIG_IOMMU_STRESS is not set

So kernel vt-d support is on. Not sure what to look for in dmesg thou... I 
didn't look into the BIOS settings yet, but usually if there is such an 
option I turn it on because I use virtual machines.

Regards,
Kai