How do I disable display power management on bullseye?

From	Tristan Miller <psychonaut@nothingisreal.com>
Newsgroups	linux.debian.user
Subject	How do I disable display power management on bullseye?
Date	2021-05-16 15:30 +0200
Message-ID	<Cfp0d-2d3-1@gated-at.bofh.it> (permalink)
Organization	A noiseless patient Spider

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Dear all,

I've got an Intel NUC10i3FNH on which I've done a fresh install of 
buster and then upgraded to bullseye.  After exactly five minutes of 
inactivity, the display (connected via HDMI) fades to black and then 
shortly thereafter shuts off completely.  How can I inhibit this 
behaviour?  I need the monitor to remain on all the time.

Here are some things I've tried so far:

1) Disable idle activation for my user account:

$ gsettings set org.gnome.desktop.screensaver idle-activation-enabled false

2) Disable sleep for my user account:

$ gsettings set org.gnome.settings-daemon.plugins.power 
sleep-inactive-ac-type 'nothing'
$ gsettings set org.gnome.settings-daemon.plugins.power 
sleep-inactive-ac-timeout 0

3) Disable sleep for the login manager:

# cat << EOF > /etc/gdm3/greeter.dconf-defaults
sleep-inactive-ac-timeout
sleep-inactive-ac-type='nothing'
EOF

4) Disable sleep for the X server globally:

# cat << EOF > /etc/X11/xorg.conf.d/xorg.conf.d
Section "ServerFlags"
     Option "BlankTime" "0"
     Option "StandbyTime" "0"
     Option "SuspendTime" "0"
     Option "OffTime" "0"
EndSection
EOF

5) Disable sleep for the current X session:

$ xset s off s noblank s 0 0 s noexpose


None of these measures have stopped the screen from blanking and 
eventually shutting off altogether after five minutes.  What else should 
I be doing?

When I run xset q, the relevant output is as follows:

Screen Saver:
   prefer blanking:  no    allow exposures:  yes
   timeout:  0    cycle:  0
DPMS (Energy Star):
   Server does not have the DPMS Extension

Regards,
Tristan

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
                   Tristan Miller
Free Software developer, ferret herder, logologist
              https://logological.org/
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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How do I disable display power management on bullseye? Tristan Miller <psychonaut@nothingisreal.com> - 2021-05-16 15:30 +0200
  Re: How do I disable display power management on bullseye? didier gaumet <didier.gaumet@gmail.com> - 2021-05-16 18:00 +0200
    Re: How do I disable display power management on bullseye? Tristan Miller <psychonaut@nothingisreal.com> - 2021-05-16 23:30 +0200

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