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
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.
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.