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

[Peter Senna]

Hi,

I'm trying to fix a bug that is affecting me for more than two years
now. It is happening in a Toshiba R830-10P notebook.

I've filled a bug report: https://bugzilla.redhat.com/show_bug.cgi?id=787299

And recently asked for help on the LKML: https://lkml.org/lkml/2013/11/1/186

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

Any ideas on how to debug this issue without a serial port?

Thanks!


-- 
Peter