[Bug 89360] [bdw-u iommu] random system freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89360

Bobby Powers <bobbypowers at gmail.com> changed:

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                 CC|                            |bobbypowers at gmail.com

--- Comment #5 from Bobby Powers <bobbypowers at gmail.com> ---
some additional info - my BIOS (3rd gen x1 carbon) apparently marks x2apic as
broken.  I booted a number of times with intremap=no_x2apic_optout on the
kernel command line, and saw what steveej mentioned: a hard freeze.

The system did have the foresight to save the dmesg into the EFI pstore. I have
those logs if they are useful.

After removing no_x2apic_optout, the kernel "Enabled IRQ remapping in xapic
mode", and under xapic some of the time the kernel was able to recover/reset
the chip to an ok-enough state that I could save dmesg and grap the GPU dump
from /sys/class/drm/card0/error.

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