Bug 57120

Summary: DPMS does not cause VisibilityNotify events
Product: xorg Reporter: Oliver Henshaw <oliver.henshaw>
Component: Server/GeneralAssignee: Xorg Project Team <xorg-team>
Status: RESOLVED MOVED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description Oliver Henshaw 2012-11-14 15:48:16 UTC 
According to http://www.x.org/releases/X11R7.6/doc/libX11/specs/libX11/libX11.html#VisibilityNotify_Events "A region of a window is visible if someone looking at the screen can actually see it.". Thus it makes sense for VisibilityNotify events to be fired when the screen blanks due to DPMS. I understand VisibilityNotify events on screensaver or on window obscuration are only possible with a non-compositing window manager but some kind of event must be possible when putting the display into a DPMS mode, right?

There's some circumstancial evidence that this used to work - e.g. http://lists.kde.org/?l=kwin&m=125068441515308&w=2 - although I haven't been able to find any old fedora livecds where this works.


How to reproduce:

I used the script in http://stackoverflow.com/questions/1667525/visibility-notify-event-in-pygtk to show VisibilityNotify events. I see events when hiding the window or locking the screen with a non-compositing kwin, as expected. But I see no events with either a compositing or non-compositing kwin after 'sleep 10; xset dpms off'.

Packages affected:

xorg-x11-xserver-Xorg-1.13.0-7.fc18.x86_64
libXext-1.3.1-2.fc18.x86_64
libX11-1.5.0-3.fc18.x86_64
Comment 1 Adam Jackson 2018-07-30 15:46:41 UTC 
Whatever these bugs are, they are probably not libXext's fault.
Comment 2 GitLab Migration User 2018-12-13 22:27:37 UTC 
-- GitLab Migration Automatic Message --

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