Comment # 21 on bug 76732 from patrick.clara@gmail.com

I tryed again with nouveau.debug=debug and drm.debug=0xe, but this time I added
drm_kms_helper.poll=0.

The dmesg output is the same as without drm_kms_helper.poll=0.
Even these lines are still present:

[   85.722596] [drm:drm_helper_hpd_irq_event], [CONNECTOR:17:eDP-1] status
updated from connected to connected
[   85.723677] [drm:drm_helper_hpd_irq_event], [CONNECTOR:21:HDMI-A-1] status
updated from disconnected to disconnected