I resolved putting this in the /etc/modprobe.d/nvidia-kernel-nkc file:
options nvidia_new NVreg_Mobile=1 NVreg_RegistryDwords="PerfLevelSrc=0x2222"

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monitor/video garbage (out of sync) even in a console (ALT+F2)
https://bugs.launchpad.net/bugs/212526
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