Public bug reported:
Installed Ubuntu 11.04 on a brand new laptop with 8GB RAM. Set off Update
Manager in an update and upgrade cycle.
Within a minute, experiencing constant kernel errors in dmesg:
DMA: Out of SW-IOMMU space for 8124 bytes at device 0000:08:00.0
(The number of bytes varies.)
Immediately network traffic ceases and the root filesystem remounts ro.
(Note I have also experienced root filesystem corruption.)
Booting with mem=3G, prevents the issue so it appears to be a problem
that occurs with 4-8GB RAM and this chipset.
Upgraded kernel to latest 2.6.38-11-generic; the problem persists.
Tried cmdlines intel_iommu=off and iommu=off, no change, laptop won't boot with
iommu=off and stops at initramfs prompt. Also tried BIOS OS options 'Other' and
'Windows 7 / Vista' (default), no change.
Laptop has Intel Corportation Mobile 4 Series Chipset.
Attaching lspci etc.
** Affects: linux-meta (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/856496
Title:
DMA: Out of SW-IOMMU space on 8GB RAM Intel Mobile 4 Series Chipset
Laptop
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