highsciguy wrote:How to optimize KDE when VNC'ing

Hi everyone,

I realize this is an old thread. I stumbled upon it when I was trying to optimize VNC access. I figure others might too.

Use Cases
I only have one user remotely accessing my desktop.

On connect

• Disable compositor

On disconnect

• Enable compositor
• Lock screen
• Enable the display's power save - turn off the display

Implementation

VNC server
I use x11vnc. Its man page documents two arguments:

• -afteraccept -- run a user supplied command after a client has been accepted and authenticated.
• -gone -- the companion to the above, except when a client disconnects

In my PATH I have two shell scripts (more below):

• vnc_client_connect
• vnc_client_disconnect

Below is an invocation fragment of x11vnc:

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x11vnc -afteraccept 'vnc_client_connect &' -gone 'vnc_client_disconnect &' ...

Scripts
vnc_client_connect

Code: Select all

#!/bin/bash

#
# x11vnc hook script when a VNC cliient connects
#

compositing_off

exit 0

compositing_off

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#!/bin/bash

#
# Use qdbusviewer-qt5 to determine the three parameters
# to pass.
#

qdbus-qt5 org.kde.KWin /Compositor org.kde.kwin.Compositing.suspend

vnc_client_disconnect

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#!/bin/bash

#
# x11vnc hook script when a VNC cliient disconnects
#

compositing_on
lock_screen

exit 0

compositing_on

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#!/bin/bash

#
# Use qdbusviewer-qt5 to determine the three parameters
# to pass.
#

qdbus-qt5 org.kde.KWin /Compositor org.kde.kwin.Compositing.resume

lock_screen

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#!/bin/bash

#
# Lock my screen from the command line ... so I can use a pull-down
# menu ... too.
#
# I'm nearly certain that Kevin K. was instrumental with this
# solution so I'll give full credit to him.
#

# kde 3
# dcop kdesktop KScreensaverIface lock

# kde 4 < 4.10
# qdbus org.kde.krunner /ScreenSaver Lock

# kde 4.10
#
# https://bugzilla.redhat.com/show_bug.cgi?id=922690
#
qdbus-qt5 org.freedesktop.ScreenSaver /ScreenSaver Lock

sleep 5
xset -display :0.0 dpms force off &

exit $?