Mitigation for light attenuation looking different with gamma correction. Assume that light attenuation wants to be linearized before we apply gamma correction.

indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl

@@ -125,6 +125,8 @@ void main()
 			float fa = light_col[i].a+1.0;
 			float dist_atten = clamp(1.0-(dist2-1.0*(1.0-fa))/fa, 0.0, 1.0);
 			
+			dist_atten = pow(dist_atten, 2.2) * 2.2;
+
 			dist_atten *= noise;
 
 			float lit = da * dist_atten;

indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl

@@ -169,6 +169,7 @@ void main()
 	
 	float fa = falloff+1.0;
 	float dist_atten = min(1.0-(dist2-1.0*(1.0-fa))/fa, 1.0);
+	dist_atten = pow(dist_atten, 2.2) * 2.2;
 	if (dist_atten <= 0.0)
 	{
 		discard;

indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl

@@ -111,6 +111,7 @@ void main()
 	vec3 col = texture2DRect(diffuseRect, frag.xy).rgb;
 	float fa = falloff+1.0;
 	float dist_atten = clamp(1.0-(dist2-1.0*(1.0-fa))/fa, 0.0, 1.0);
+	dist_atten = pow(dist_atten, 2.2) * 2.2;
 	float lit = da * dist_atten * noise;
 
 	col = color.rgb*lit*col;

indra/newview/app_settings/shaders/class1/deferred/spotLightF.glsl

@@ -175,6 +175,7 @@ void main()
 	
 	float fa = falloff+1.0;
 	float dist_atten = min(1.0-(dist2-1.0*(1.0-fa))/fa, 1.0);
+	dist_atten = pow(dist_atten, 2.2) * 2.2;
 	if (dist_atten <= 0.0)
 	{
 		discard;

indra/newview/app_settings/shaders/class2/deferred/multiSpotLightF.glsl

@@ -184,6 +184,7 @@ void main()
 	
 	float fa = falloff+1.0;
 	float dist_atten = min(1.0-(dist2-1.0*(1.0-fa))/fa, 1.0);
+	dist_atten = pow(dist_atten, 2.2) * 2.2;
 	if (dist_atten <= 0.0)
 	{
 		discard;

indra/newview/app_settings/shaders/class2/deferred/spotLightF.glsl

@@ -185,6 +185,7 @@ void main()
 	
 	float fa = falloff+1.0;
 	float dist_atten = min(1.0-(dist2-1.0*(1.0-fa))/fa, 1.0);
+	dist_atten = pow(dist_atten, 2.2) * 2.2;
 	if (dist_atten <= 0.0)
 	{
 		discard;