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Description of problem:
On HP ELiteBook 2540p with Intel Ironlake Graphics, the drm rebased uncovered a bug in the IOMMU hardware. This causes the panic unless graphics passthrough is enabled.
Version-Release number of selected component (if applicable):
How reproducible:
Run for a few hours with a kernel build in a terminal
Plan is get Intel to fix or if not just disable IOMMU for graphics device for G4x and Ironlake.
Comment 1RHEL Program Management
2011-08-05 10:09:43 UTC
This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update release.
Better reproducer,
Get a ILK laptop that supports VT-d properly, HP Elitebook 2540p, not a lot of Lenovo ILK fail to enable graphics VT-d due to a bios bug.
Use desktop effects to enable compiz, open a gnome-terminal
run while [ 1 == 1 ]; do find . ; done
Leave running as long as possible, eventually machine will hang.
If the Ironlake can enable VT-D and if VT-d works on it.
Some BIOSes mess up, you'll see
DMAR: BIOS has allocated no shadow GTT; disabling IOMMU for graphics
in dmesg, reproducing on these is also difficult (if possible at all).
Comment 11Aristeu Rozanski
2011-10-25 14:51:28 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHSA-2011-1530.html