[PROBLEM] Amplifier autoswitching input

[pszafer]

Software
XBian version: 20160212-1
XBMC/Kodi version: 16

Hardware
Device type and model: RPi2
Power supply rating: 2A
Connected devices: Rpi2 --> Amplifier Onkyo TX-NR509 --> Projector

Log files
Nothing in logs.

Problem description:
Hello,
When I turn on amplifier, Xbian is switching input on amplifier to input where xbian is connected.
How can I disable this?

In /boot/config.txt I have hdmi_ignore_cec_init=1 but this as I understand concern turning on Xbian, not amplifier itself.
In /etc/default/xbmc I have all disabled/no.

I had OSMC before and then this problem didn't occur.
I don't want to disable CEC capability, because in Xbian it is working great! I can manage Xbian by projector remote.