[kdelibs] [Bug 359068] New: kded4 updates user time (XA_NET_WM_USER_TIME) to ancient values on power management events

[Xin Guan via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=359068

            Bug ID: 359068
           Summary: kded4 updates user time (XA_NET_WM_USER_TIME) to
                    ancient values on power management events
           Product: kdelibs
           Version: 4.14.0
          Platform: unspecified
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: kded
          Assignee: unassigned-bugs at kde.org
          Reporter: guanx.bac at gmail.com

When kde tries to lower the screen brightness due to user idleness, kded4
updates its user time (_NET_WM_USER_TIME) property to the time when kde was
started.
Because recent xscreensaver (>= version 5.33) monitors update of USER_TIME, the
password dialog will be brought up every 150 seconds when it sees the USER_TIME
update of kded4, so the screen is never powered down, and the password dialog
of xscreensaver pops up repeatedly.


Reproducible: Always

Steps to Reproduce:
1. Start kde4 with kdelibs-4.14.6 and kde-workspace-4.11.17 (may also apply to
other versions);
2. Activate xscreensaver (>= version 5.33) with xscreensaver-command -activate
or -lock;
3. Wait for a few minutes (150s in my case) for kde to try to lower the screen
brightness.

Actual Results:  
Screen brightness stayed the same, and the password dialog of xscreensaver was
brought up.

Expected Results:  
Screen brightness is lowered.

This happens 100% of the time on a ThinkPad laptop, and almost 100% on a
desktop computer. Because it is impossible to let xscreensaver monitor
USER_TIME update "optionally", any update of this window property will break
its idleness test. So ... can kded not update USER_TIME on power events --
especially on kde's self-generated power events (i.e., not from the user
pressing Fn+Home/End and alike)?

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