To answer your last question first, the reason Ubuntu tries to load both
modules is that it has a different kernel module loading process, which
was introduced to support both fastboot/upstart and flicker-free
graphical boot/plymouth. But there are (obviously) some bugs in the
module loading logic when multiple video cards are present, such as in
your case.
Specifically, the presence of multiple kernel graphics drivers trips up
the i915 kernel module driver and results in a gpu event to be
triggered; however it is able to realize there isn't actually a serious
problem, and it just resets the GPU and continues. However, that
triggering is enough to fire up apport to prompt you to report a bug.
So, aside from the kernel module loading logic being a bit flimsy in
this case, there isn't anything specifically broken that you need to
worry about. The logic should perhaps be cleaned up better (we already
have bugs filed to this end).
** Also affects: xdiagnose (Ubuntu)
Importance: Undecided
Status: New
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/752940
Title:
GPU lockup (ESR: 0x00000010 PGTBL_ER: 0x00000010) - i915 unused but
triggers apport on multi-gpu system unless blacklisted
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