diff --git a/src/com/limelight/input/EvdevAbsolute.java b/src/com/limelight/input/EvdevAbsolute.java
index 5534b6e..2c41eb5 100644
--- a/src/com/limelight/input/EvdevAbsolute.java
+++ b/src/com/limelight/input/EvdevAbsolute.java
@@ -11,14 +11,18 @@ public class EvdevAbsolute {
 	
 	public final static int UP = 1, DOWN = -1, NONE = 0;
 	
+	private static final int SHORT_MAX_UNSIGNED = 0xFFFF;
+	private static final int BYTE_MAX_UNSIGNED = 0xFF;
 	private final static int ABS_OFFSET = 0x40;
 	private final static int READ_ONLY = 2;
 	private final static char EVDEV_TYPE = 'E';
 	
+	private int max;
 	private int avg;
 	private int range;
 	
 	private boolean reverse;
+	private boolean signed;
 	
 	public EvdevAbsolute(String filename, int axis, boolean reverse) {
 		ByteBuffer buffer = ByteBuffer.allocate(6*4);
@@ -29,10 +33,10 @@ public class EvdevAbsolute {
 		
 		buffer.getInt(); //Skip current value
 		int min = buffer.getInt();
-		int max = buffer.getInt();
+		max = buffer.getInt();
 		avg = (min+max)/2;
 		range = max-avg;
-		
+		signed = min < 0;
 		this.reverse = reverse;
 	}
 	
@@ -46,7 +50,10 @@ public class EvdevAbsolute {
 	 * @return input value as short
 	 */
 	public short getShort(int value) {
-		return (short) ((value-avg) * (reverse?-range:range) / Short.MAX_VALUE);
+		if (signed)
+			return (short) ((reverse ? -1 - value : value) * (Short.MAX_VALUE + 1) / (max + 1));
+		else
+			return (short) ((reverse ? max - value : value) * SHORT_MAX_UNSIGNED / max);
 	}
 	
 	/**
@@ -55,7 +62,11 @@ public class EvdevAbsolute {
 	 * @return input value as byte
 	 */
 	public byte getByte(int value) {
-		return (byte) ((value-avg) * (reverse?-range:range) / Byte.MAX_VALUE);
+		if (signed) {
+			return (byte) ((reverse ? -1 - value : value) * (Byte.MAX_VALUE + 1) / (max + 1));
+		} else {
+			return (byte) ((reverse ? max - value : value) * BYTE_MAX_UNSIGNED / max);
+		}
 	}
 	
 	/**