Comment 7 for bug 911236

Hi,

I'm forwarding this bug on behalf of an Ubuntu bug reporter Jamie Strandboge:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/911236

On a Lenovo X201s running an Ubuntu 3.2.0-7.13-generic kernel which was rebased on upstream v3.2-rc7 Jamie's witnessing repeated fault messages in dmesg and experiencing system 'pauses' every few seconds. The repeated dmesg output is as follows:

[ 56.996322] DRHD: handling fault status reg 2
[ 56.996330] DMAR:[DMA Write] Request device [00:02.0] fault addr 7bf1c7000
[ 56.996332] DMAR:[fault reason 05] PTE Write access is not set

00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])

Jamie can confirm that booting with 'intel_iommu=igfx_off' resolves the issue and he no longer sees the repeated messages nor experiences the system pausing.

His full lspci output can be seen at:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/911236/+attachment/2655442/+files/Lspci.txt

And dmesg output at:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/911236/+attachment/2655434/+files/BootDmesg.txt

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/911236/+attachment/2655439/+files/CurrentDmesg.txt

Please let us know if you need any additional information. Thanks in advance.