[Xfce-bugs] [Bug 16400] New: Monitor unable to suspend

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=16400

            Bug ID: 16400
           Summary: Monitor unable to suspend
    Classification: Xfce Core
           Product: Xfce4-settings
           Version: 4.12.1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Medium
         Component: Display Settings
          Assignee: xfce-bugs at xfce.org
          Reporter: abchk1234 at gmail.com
  Target Milestone: Xfce 4.14

Hi,

Due to a combination of Monitor hardware and graphics driver, my monitor is
unable sleep (DPMS). Whenever it tries to suspend, xfsettingsd detects that
something has changed and tries to reconfigure it. This results in the monitor
waking up again after a second.

"Configure new displays when connected" is OFF in display settings.

Hardware and software details below.

Hardware:
BENQ GW2283 monitor connected via HDMI to Rock Pi 4 SBC.

Software:
Linux 5.3.11 (also tested with 5.4.8)
X.Org 1.20.4 (also tested with 1.20.6)
Xfce 4.12
Mesa 18.3.6 (also tested with 19.3.1 and 20.0-git)

Other people also face this issue, for example with amdgpu drivers:
https://gitlab.freedesktop.org/drm/amd/issues/662

To fix it, people have modifying xfsettingsd to ignore the RRScreenChangeNotify
event (mentioned in gitlab issue above). I think xfsettingsd can be updated to
ignore this event when "Configure new displays when connected" is off.

Alternatively, an option can be added in xfconf to not check for these events
like here:
https://bugzilla.xfce.org/show_bug.cgi?id=10459

Thanks.

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