VT-d and x2apic: broken resume after suspend to ram

[Peter Senna Tschudin]

I have one notebook that is failing to resume after suspend to ram.
I've filled a bug report back on the 2.6.41 days:

https://bugzilla.redhat.com/show_bug.cgi?id=787299

The issue is that trying to resume after suspending to ram freezes the
computer. The resume starts well, but then it hangs.

Yesterday I found that this may be related to VT-d / x2apic. If I
disable VT-d on the BIOS, suspend / resume works fine. If I enable
VT-d and pass nox2apic as boot parameter to Kernel suspend and resume
works fine. I would like some pointers to fix this issue. Can you help
me?

Only when I have VT-d enabled, dmesg gives me additional output:
[    0.023913] IOAPIC id 2 under DRHD base  0xfed91000 IOMMU 1
[    0.024080] Enabled IRQ remapping in x2apic mode
[    0.024081] Enabling x2apic
[    0.024082] Enabled x2apic
[    0.024087] Switched APIC routing to cluster x2apic.

The notebook is Toshiba R830-10p with i7-2620M.

Thanks!
-- 
Peter
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