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0e1f616
(Get the code!)
Enabling proposed on eoan, and upgrading kernel to 5.3.0-24-generic fixes the issue.
In eoan 19.10 the way graphics switch between nvidia and intel changed, specifically:
If system booted with Intel, nvidia is not detectable on lspci and a reboot is required to use it, so nvidia is sort of disabled and the issue doesn't exist.
If system booted with nvidia, you can switch to intel by logging out/in, but nvidia card remains powered on until next reboot, so this bug is applied on this case.
In the second case, after upgrading kernel from proposed, nvidia card was disabled when not used, as expected. So I conclude that the problem is solved.
It is worth noted that after upgrading, snd_hda_codec_hdmi displayed errors on dmesg about "hdaudioC1D0: HDMI: invalid ELD buf size -1". Also powerstat -D reports a watt elevated idling CPU power consumption from RAPL(from ~1.3 to 2.3), though it may be due to unrelated reason.