[Xfce-bugs] [Bug 11491] xflock4 does not turn off screen due to lack of sleep

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=11491

--- Comment #9 from Chris Bainbridge <chris.bainbridge at gmail.com> ---
> With the patch: 1 second delay, then a black screen
> Without the patch: black screen immediately

slock will always show a black screen but is the monitor actually turned off
with DPMS - my monitor shows "Entering power save mode" when this happens and
turns off the back light.

Try this: in a terminal type "xset dpms force off" and press and hold the enter
key for one second before releasing it. The key press event will cause the
execution of the xset command, but then the release event will wake the monitor
back up. The same happens with the ctrl-alt-delete shortcut.


> Of course if you can link to others complaining about the issue

http://www.shallowsky.com/linux/x-screen-blanking.html
http://askubuntu.com/questions/38776/trigger-screensaver-off-monitor
https://wiki.archlinux.org/index.php/Display_Power_Management_Signaling
http://ubuntuforums.org/showthread.php?t=1317747&page=4
http://unix.stackexchange.com/questions/4466/screen-turns-on-automatically-xset-dpms-force-off


The explanation:

"You're using it manually from command line or xset is binded to some keyboard
shortcut? On my brother laptop this command was binded to some keys and after
that monitor was turned off and on again, because when he was releasing key
next event was emitted. Turning it off after quick sleep solved problem: perl
-e 'select(undef,undef,undef,.1)' && xset dpms force off - this perl expression
do sleep for 0.1 sec."

The timeout has to be longer than the delay between a person pressing the enter
key and then releasing it.

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