Comment # 1 on bug 966631 from Takashi Iwai

Usually the "corrupted low memory" message is triggered by bad BIOS behavior
and harmless in most cases (as kernel keeps these low memory intact).  But I
don't remember of the recent change in x86 that may start poking it...  Boris,
any clue?

Regarding i915 warnings: you may try the package OBS Kernel:stable repo.  It
contains a few more i915-specific fixes.