Bug#941149: Steam breaks DPMS while running

[Sven Bartscher]

Package: steam
Version: 1.0.0.61-2
Severity: normal

Apparently when steam is running prevents any DPMS timers to actually
power down the display. I think this is might be considered a feature
in some situations where the display is supposed to stay on, but for
me steam keeps the display on when it is just minimized into the
system tray, so there is literally nothing that steam might show me
that would justify keeping the display from going into standby.

I used these steps to reproduce the problem:

* Steam is not running
* Run `xset dpms 0 0 5` to be able to quickly tell if dpms still works
  (it does at this point)
* Start steam and wait for it to minimize into the system tray (dpms
  still works)
* Open the steam library from the system tray
* DPMS doesn't trigger anymore

At this point DPMS doesn't trigger based on time anymore. Minimizing
steam doesn't make it work again. The only way I found to make DPMS
work again is to close steam completely.

Apparently this only affects time based DPMS. Using
`xset dpms force *` still works as expected.

I'm running steam in XFCE with xmonad instead of xfwm.

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing-debug
  APT policy: (990, 'testing-debug'), (990, 'testing'), (102, 'unstable-debug'), (102, 'unstable'), (101, 'experimental-debug'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.2.0-2-amd64 (SMP w/12 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8), LANGUAGE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages steam depends on:
ii  debconf [debconf-2.0]  1.5.73
ii  libc6                  2.29-1
ii  libgl1-mesa-dri        19.1.6-1
ii  libgl1-mesa-glx        19.1.6-1
ii  libgpg-error0          1.36-7
ii  libstdc++6             9.2.1-8
ii  libudev1               242-7
ii  libx11-6               2:1.6.7-1
ii  libxcb-dri3-0          1.13.1-2
ii  libxinerama1           2:1.1.4-2
ii  xz-utils               5.2.4-1+b1

Versions of packages steam recommends:
ii  ca-certificates                       20190110
ii  fontconfig                            2.13.1-2+b1
ii  fonts-liberation                      1:1.07.4-10
ii  libxss1                               1:1.2.3-1
ii  mesa-vulkan-drivers                   19.1.6-1
ii  steam-devices                         1.0.0.61-2
ii  xfce4-terminal [x-terminal-emulator]  0.8.8-1+b1
ii  xterm [x-terminal-emulator]           348-2

Versions of packages steam suggests:
ii  nvidia-driver-libs-i386  430.40-2
ii  nvidia-vulkan-icd        430.40-2

Versions of packages steam is related to:
ii  libc6                           2.29-1
ii  libgl1                          1.1.0-1+b1
ii  libgl1-mesa-dri                 19.1.6-1
ii  libglx-mesa0 [libglx-vendor]    19.1.6-1
ii  libglx-nvidia0 [libglx-vendor]  430.40-2
ii  libxcb-dri3-0                   1.13.1-2
ii  nvidia-driver                   430.40-2
ii  nvidia-driver-libs              430.40-2
ii  nvidia-driver-libs-i386         430.40-2

-- debconf information:
* steam/question: I AGREE
* steam/license:
  steam/purge:
  steam/need-nvidia-i386:

-- debsums errors found:
debsums: package steam is not installed