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<body><span class="vcard"><a class="email" href="mailto:bobbypowers@gmail.com" title="Bobby Powers <bobbypowers@gmail.com>"> <span class="fn">Bobby Powers</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - [bdw-u iommu] random system freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89360">bug 89360</a>
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<td>bobbypowers@gmail.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [bdw-u iommu] random system freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89360#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [bdw-u iommu] random system freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89360">bug 89360</a>
from <span class="vcard"><a class="email" href="mailto:bobbypowers@gmail.com" title="Bobby Powers <bobbypowers@gmail.com>"> <span class="fn">Bobby Powers</span></a>
</span></b>
<pre>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.</pre>
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