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[Qemu-devel] [PATCH 4/4] doc: document the Pseudo-encoding of LED state

From: Lei Li
Subject: [Qemu-devel] [PATCH 4/4] doc: document the Pseudo-encoding of LED state
Date: Thu, 25 Apr 2013 13:29:12 +0800

Signed-off-by: Lei Li <address@hidden>
 docs/vnc-ledstate-Pseudo-encoding.txt |   50 +++++++++++++++++++++++++++++++++
 1 files changed, 50 insertions(+), 0 deletions(-)
 create mode 100644 docs/vnc-ledstate-Pseudo-encoding.txt

diff --git a/docs/vnc-ledstate-Pseudo-encoding.txt 
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+VNC LED state Pseudo-encoding
+This document describes the Pseudo-encoding of LED state for RFB which
+is the protocol used in VNC as reference link below:
+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
+To solve this problem it attempts to add LED state Pseudo-encoding
+extension to VNC protocol to deal with setting LED state.
+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
+======= ===============================================================

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