Hit this same bug on my X220. Will try mainline and see if it happens again.
Similar reports:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1312996
https://bugzilla.redhat.com/show_bug.cgi?id=1060387
** Changed in: linux (Ubuntu)
Status: Incomplete => New
** Bug watch added: Red Hat Bugzilla #1060387
https://bugzilla.redhat.com/show_bug.cgi?id=1060387
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https://bugs.launchpad.net/bugs/1312417
Title:
------------[ cut here ]------------ MMIO read or write has been
dropped ffffffff
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