Comment # 1 on bug 940905 from Takashi Iwai

Is this a regression?

There is an upstream fix to suppress this error message for gen3, but your chip
is gen4, so it's not covered by that.

In anyway, please open a bug report to the upstream bugzilla.freedesktop.org. 
Give some details there, e.g. the content of /proc/iomem, the output of lspci
-nv, hwinfo output, etc.