Bug#942099: gnome-shell: Screensaver doesn't power down monitor ("Server does not have the DPMS Extension")

[Conrad J.C. Hughes (for Debian package stuff)]

Package: gnome-shell
Version: 3.30.2-9
Severity: normal

Dear Maintainer,

Not entirely sure where this report should go, but the gnome-screensaver
package says that gnome-shell does screensaving these days..

Before I upgraded to buster and Wayland, Debian would send my monitor to sleep
when the screensaver kicked in.  It doesn't do this any more.

There's nothing in Device Settings for my monitor, or Power Management
Settings, about sending the monitor to sleep.

Investigating, I find that "xset q" reports "Server does not have the DPMS
Extension".

This thread suggests that I might be wrong to investigate using "xset", but
whatever xset's been replaced with clearly isn't working.

  https://unix.stackexchange.com/questions/316929/display-is-not-capable-of-
dpms-after-gnome-wayland-update

The busctl invocations described in the thread do work:

  busctl --user set-property org.gnome.Mutter.DisplayConfig
/org/gnome/Mutter/DisplayConfig org.gnome.Mutter.DisplayConfig PowerSaveMode i
1

Did the upgrade from stretch fail to install some crucial package?  Where
should I now be configuring Gnome to send my monitor to sleep?

Best,
Conrad



-- System Information:
Debian Release: 10.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-6-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnome-shell depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.30.1-2
ii  evolution-data-server                        3.30.5-1
ii  gir1.2-accountsservice-1.0                   0.6.45-2
ii  gir1.2-atspi-2.0                             2.30.0-7
ii  gir1.2-freedesktop                           1.58.3-2
ii  gir1.2-gcr-3                                 3.28.1-1
ii  gir1.2-gdesktopenums-3.0                     3.28.1-1
ii  gir1.2-gdm-1.0                               3.30.2-3
ii  gir1.2-geoclue-2.0                           2.5.2-1
ii  gir1.2-glib-2.0                              1.58.3-2
ii  gir1.2-gnomebluetooth-1.0                    3.28.2-4~deb10u1
ii  gir1.2-gnomedesktop-3.0                      3.30.2.1-2
ii  gir1.2-gtk-3.0                               3.24.5-1
ii  gir1.2-gweather-3.0                          3.28.2-2
ii  gir1.2-ibus-1.0                              1.5.19-4+deb10u1
ii  gir1.2-mutter-3                              3.30.2-7
ii  gir1.2-nm-1.0                                1.14.6-2
ii  gir1.2-nma-1.0                               1.8.20-1.1
ii  gir1.2-pango-1.0                             1.42.4-7~deb10u1
ii  gir1.2-polkit-1.0                            0.105-25
ii  gir1.2-rsvg-2.0                              2.44.10-2.1
ii  gir1.2-soup-2.4                              2.64.2-2
ii  gir1.2-upowerglib-1.0                        0.99.10-1
ii  gjs                                          1.54.3-1
ii  gnome-backgrounds                            3.30.0-1
ii  gnome-settings-daemon                        3.30.2-3
ii  gnome-shell-common                           3.30.2-9
ii  gsettings-desktop-schemas                    3.28.1-1
ii  libatk-bridge2.0-0                           2.30.0-5
ii  libatk1.0-0                                  2.30.0-2
ii  libc6                                        2.28-10
ii  libcairo2                                    1.16.0-4
ii  libcanberra-gtk3-0                           0.30-7
ii  libcanberra0                                 0.30-7
ii  libcroco3                                    0.6.12-3
ii  libecal-1.2-19                               3.30.5-1
ii  libedataserver-1.2-23                        3.30.5-1
ii  libgcr-base-3-1                              3.28.1-1
ii  libgdk-pixbuf2.0-0                           2.38.1+dfsg-1
ii  libgirepository-1.0-1                        1.58.3-2
ii  libgjs0g                                     1.54.3-1
ii  libglib2.0-0                                 2.58.3-2+deb10u1
ii  libglib2.0-bin                               2.58.3-2+deb10u1
ii  libgstreamer1.0-0                            1.14.4-1
ii  libgtk-3-0                                   3.24.5-1
ii  libical3                                     3.0.4-3
ii  libjson-glib-1.0-0                           1.4.4-2
ii  libmutter-3-0                                3.30.2-7
ii  libnm0                                       1.14.6-2
ii  libpango-1.0-0                               1.42.4-7~deb10u1
ii  libpangocairo-1.0-0                          1.42.4-7~deb10u1
ii  libpolkit-agent-1-0                          0.105-25
ii  libpolkit-gobject-1-0                        0.105-25
ii  libpulse-mainloop-glib0                      12.2-4+deb10u1
ii  libpulse0                                    12.2-4+deb10u1
ii  libsecret-1-0                                0.18.7-1
ii  libstartup-notification0                     0.12-6
ii  libsystemd0                                  241-7~deb10u1
ii  libx11-6                                     2:1.6.7-1
ii  libxfixes3                                   1:5.0.3-1
ii  mutter                                       3.30.2-7
ii  python3                                      3.7.3-1

Versions of packages gnome-shell recommends:
ii  bolt                  0.7-2
ii  chrome-gnome-shell    10.1-5
ii  gdm3                  3.30.2-3
ii  gkbd-capplet          3.26.1-1
ii  gnome-control-center  1:3.30.3-2~deb10u1
ii  gnome-user-docs       3.30.2-1
ii  iio-sensor-proxy      2.4-2
ii  switcheroo-control    1.2-2
ii  unzip                 6.0-23+deb10u1

Versions of packages gnome-shell suggests:
ii  gir1.2-telepathyglib-0.12   0.24.1-2
ii  gir1.2-telepathylogger-0.2  0.8.2-3

-- no debconf information