diff --git a/indra/llrender/llshadermgr.cpp b/indra/llrender/llshadermgr.cpp
index 87d1cfd40..e4b7fb7c0 100644
--- a/indra/llrender/llshadermgr.cpp
+++ b/indra/llrender/llshadermgr.cpp
@@ -668,10 +668,6 @@ GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shade
 		}
 	}
 
-	static const LLCachedControl<bool> SHPackDeferredNormals("SHPackDeferredNormals",false);
-	if(SHPackDeferredNormals)
-		text[count++] = strdup("#define PACK_NORMALS\n");
-
 	if(defines)
 	{
 		for (std::map<std::string,std::string>::iterator iter = defines->begin(); iter != defines->end(); ++iter)
diff --git a/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl b/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl
index 00d691502..cfc9d7c0d 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/alphaF.glsl
@@ -74,6 +74,10 @@ uniform float shadow_bias;
 uniform sampler2D diffuseMap;
 #endif
 
+#ifdef IS_AVATAR_SKIN
+uniform float minimum_alpha;
+#endif
+
 VARYING vec3 vary_fragcoord;
 VARYING vec3 vary_position;
 VARYING vec2 vary_texcoord0;
@@ -454,7 +458,33 @@ vec3 fullbrightScaleSoftClip(vec3 light)
 
 void main() 
 {
-	
+#ifdef USE_INDEXED_TEX
+	vec4 diff = diffuseLookup(vary_texcoord0.xy);
+#else
+	vec4 diff = texture2D(diffuseMap,vary_texcoord0.xy);
+#endif
+#ifdef USE_VERTEX_COLOR
+	float final_alpha = diff.a * vertex_color.a;
+	diff.rgb *= vertex_color.rgb;
+#else
+	float final_alpha = diff.a;
+#endif
+
+#ifdef IS_AVATAR_SKIN
+	if(final_alpha < minimum_alpha)
+	{
+		discard;
+	}
+#endif
+#ifdef FOR_IMPOSTOR
+	// Insure we don't pollute depth with invis pixels in impostor rendering
+	//
+	if (final_alpha < 0.01)
+	{
+		discard;
+	}
+#endif
+
 	vec4 pos = vec4(vary_position, 1.0);
 	
 	float shadow = 1.0;
@@ -528,37 +558,10 @@ void main()
 	}
 #endif
 
-#ifdef USE_INDEXED_TEX
-	vec4 diff = diffuseLookup(vary_texcoord0.xy);
-#else
-	vec4 diff = texture2D(diffuseMap,vary_texcoord0.xy);
-#endif
 
 #ifdef FOR_IMPOSTOR
-
-#ifdef USE_VERTEX_COLOR
-	float final_alpha = diff.a * vertex_color.a;
-	diff.rgb *= vertex_color.rgb;
-#else
-	float final_alpha = diff.a;
-#endif
-	
-	// Insure we don't pollute depth with invis pixels in impostor rendering
-	//
-	if (final_alpha < 0.01)
-	{
-		discard;
-	}
 	vec4 color = vec4(diff.rgb,final_alpha);
 #else
-	
-#ifdef USE_VERTEX_COLOR
-	float final_alpha = diff.a * vertex_color.a;
-	diff.rgb *= vertex_color.rgb;
-#else
-	float final_alpha = diff.a;
-#endif
-
 
 	vec4 gamma_diff = diff;	
 	diff.rgb = srgb_to_linear(diff.rgb);
diff --git a/indra/newview/lldrawpoolsimple.cpp b/indra/newview/lldrawpoolsimple.cpp
index 3f894912a..012a4b9dd 100644
--- a/indra/newview/lldrawpoolsimple.cpp
+++ b/indra/newview/lldrawpoolsimple.cpp
@@ -37,8 +37,6 @@
 #include "llviewershadermgr.h"
 #include "llrender.h"
 
-#define GE_FORCE_WORKAROUND LL_DARWIN
-
 static LLGLSLShader* simple_shader = NULL;
 static LLGLSLShader* fullbright_shader = NULL;
 
@@ -664,13 +662,6 @@ void LLDrawPoolFullbrightAlphaMask::beginPostDeferredPass(S32 pass)
 	else 
 	{	
 
-// Work-around until we can figure out why the right shader causes
-// the GeForce driver to go tango uniform on OS X 10.6.8 only
-//
-#if GE_FORCE_WORKAROUND
-		gObjectFullbrightAlphaMaskProgram.bind();
-		gObjectFullbrightAlphaMaskProgram.uniform1f(LLShaderMgr::TEXTURE_GAMMA, 2.2f);
-#else
 		if (LLPipeline::sUnderWaterRender)
 		{
 			gDeferredFullbrightAlphaMaskWaterProgram.bind();
@@ -681,7 +672,6 @@ void LLDrawPoolFullbrightAlphaMask::beginPostDeferredPass(S32 pass)
 			gDeferredFullbrightAlphaMaskProgram.bind();
 			gDeferredFullbrightAlphaMaskProgram.uniform1f(LLShaderMgr::TEXTURE_GAMMA, 2.2f);
 		}
-#endif
 	}
 
 }
@@ -704,13 +694,6 @@ void LLDrawPoolFullbrightAlphaMask::endPostDeferredPass(S32 pass)
 	}
 	else
 	{
-
-// Work-around until we can figure out why the right shader causes
-// the GeForce driver to go tango uniform on OS X 10.6.8 only
-//
-#if GE_FORCE_WORKAROUND		
-		gObjectFullbrightAlphaMaskProgram.unbind();
-#else
 		if (LLPipeline::sUnderWaterRender)
 		{
 			gDeferredFullbrightAlphaMaskWaterProgram.unbind();
@@ -719,8 +702,6 @@ void LLDrawPoolFullbrightAlphaMask::endPostDeferredPass(S32 pass)
 		{
 			gDeferredFullbrightAlphaMaskProgram.unbind();
 		}
-#endif
-
 	}
 	LLRenderPass::endRenderPass(pass);
 }