7504ae690c
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com> Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Message-id: 1366867752-11578-5-git-send-email-lilei@linux.vnet.ibm.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
51 lines
1.8 KiB
Plaintext
51 lines
1.8 KiB
Plaintext
VNC LED state Pseudo-encoding
|
|
=============================
|
|
|
|
Introduction
|
|
------------
|
|
|
|
This document describes the Pseudo-encoding of LED state for RFB which
|
|
is the protocol used in VNC as reference link below:
|
|
|
|
http://tigervnc.svn.sourceforge.net/viewvc/tigervnc/rfbproto/rfbproto.rst?content-type=text/plain
|
|
|
|
When accessing a guest by console through VNC, there might be mismatch
|
|
between the lock keys notification LED on the computer running the VNC
|
|
client session and the current status of the lock keys on the guest
|
|
machine.
|
|
|
|
To solve this problem it attempts to add LED state Pseudo-encoding
|
|
extension to VNC protocol to deal with setting LED state.
|
|
|
|
Pseudo-encoding
|
|
---------------
|
|
|
|
This Pseudo-encoding requested by client declares to server that it supports
|
|
LED state extensions to the protocol.
|
|
|
|
The Pseudo-encoding number for LED state defined as:
|
|
|
|
======= ===============================================================
|
|
Number Name
|
|
======= ===============================================================
|
|
-261 'LED state Pseudo-encoding'
|
|
======= ===============================================================
|
|
|
|
LED state Pseudo-encoding
|
|
--------------------------
|
|
|
|
The LED state Pseudo-encoding describes the encoding of LED state which
|
|
consists of 3 bits, from left to right each bit represents the Caps, Num,
|
|
and Scroll lock key respectively. '1' indicates that the LED should be
|
|
on and '0' should be off.
|
|
|
|
Some example encodings for it as following:
|
|
|
|
======= ===============================================================
|
|
Code Description
|
|
======= ===============================================================
|
|
100 CapsLock is on, NumLock and ScrollLock are off
|
|
010 NumLock is on, CapsLock and ScrollLock are off
|
|
111 CapsLock, NumLock and ScrollLock are on
|
|
======= ===============================================================
|