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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
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=============================
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Introduction
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------------
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This document describes the Pseudo-encoding of LED state for RFB which
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is the protocol used in VNC as reference link below:
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http://tigervnc.svn.sourceforge.net/viewvc/tigervnc/rfbproto/rfbproto.rst?content-type=text/plain
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When accessing a guest by console through VNC, there might be mismatch
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between the lock keys notification LED on the computer running the VNC
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client session and the current status of the lock keys on the guest
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machine.
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To solve this problem it attempts to add LED state Pseudo-encoding
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extension to VNC protocol to deal with setting LED state.
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Pseudo-encoding
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---------------
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This Pseudo-encoding requested by client declares to server that it supports
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LED state extensions to the protocol.
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The Pseudo-encoding number for LED state defined as:
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======= ===============================================================
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Number Name
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======= ===============================================================
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-261 'LED state Pseudo-encoding'
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======= ===============================================================
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LED state Pseudo-encoding
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--------------------------
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The LED state Pseudo-encoding describes the encoding of LED state which
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consists of 3 bits, from left to right each bit represents the Caps, Num,
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and Scroll lock key respectively. '1' indicates that the LED should be
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on and '0' should be off.
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Some example encodings for it as following:
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======= ===============================================================
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Code Description
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======= ===============================================================
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100 CapsLock is on, NumLock and ScrollLock are off
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010 NumLock is on, CapsLock and ScrollLock are off
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111 CapsLock, NumLock and ScrollLock are on
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======= ===============================================================
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