VT issue: "DMAR : unsupported device scope"
Bug #742296 reported by
Anton Anikin
This bug affects 2 people
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Medium
|
Unassigned |
Bug Description
kernel 2.6.38-7-generic x86_64 , ubuntu natty.
HP tm2 laptop.
Can't boot laptop with VT (virtualisation) enabled in BIOS.
Boots only frm time to time, when try to boot into the safemode - get "DMAR : unsupported device scope", this message scrolls continuously. When I disable VT in the BIOS I am able to boot without any problems.
Worked fine with old 2.6.36 kernels in ubuntu 10.10.
Appeared in the latest 2.6.38 kernels
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
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Also a tm2 laptop user, encountered this problem after installing Debian Squeeze (kernel 2.6.32-5). To boot successfully with VT enabled, edit kernel command line to include:
intel_iommu=on
This is disabled by default because it can crash systems that don't need it.