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.

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https://bugs.launchpad.net/bugs/1840835

Title:
  High power consumption using 5.0.0-25-generic

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