diff --git a/Source/Plugins/Plugin_VideoOGL/Src/PixelShaderCache.cpp b/Source/Plugins/Plugin_VideoOGL/Src/PixelShaderCache.cpp
index 29c4f75e3f..99a35b4bfd 100644
--- a/Source/Plugins/Plugin_VideoOGL/Src/PixelShaderCache.cpp
+++ b/Source/Plugins/Plugin_VideoOGL/Src/PixelShaderCache.cpp
@@ -93,10 +93,16 @@ void PixelShaderCache::Init()
 		lastPSconstants[i/4][i%4] = -100000000.0f;
 	memset(&last_pixel_shader_uid, 0xFF, sizeof(last_pixel_shader_uid));
 
-    s_displayCompileAlert = true;
+	s_displayCompileAlert = true;
 
 	glGetProgramivARB(GL_FRAGMENT_PROGRAM_ARB, GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB, (GLint *)&s_nMaxPixelInstructions);
-	
+#ifdef __linux__
+	if (strstr((const char*)glGetString(GL_VENDOR), "ATI") != NULL)
+	{
+		s_nMaxPixelInstructions = 4096;
+	}
+#endif
+
 	int maxinst, maxattribs;
 	glGetProgramivARB(GL_FRAGMENT_PROGRAM_ARB, GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB, (GLint *)&maxinst);
 	glGetProgramivARB(GL_FRAGMENT_PROGRAM_ARB, GL_MAX_PROGRAM_NATIVE_ATTRIBS_ARB, (GLint *)&maxattribs);
diff --git a/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp b/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp
index 0962004496..df38ddb3d7 100644
--- a/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp
+++ b/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp
@@ -403,8 +403,20 @@ bool Renderer::Init()
 
 	g_cgvProf = cgGLGetLatestProfile(CG_GL_VERTEX);
 	g_cgfProf = cgGLGetLatestProfile(CG_GL_FRAGMENT);
+#ifdef __linux__ 
+	// A bug was introduced in Cg2.1's handling of very large profile option values
+	// so this will not work on ATI. ATI returns MAXINT = 2147483647 (0x7fffffff)
+	// which is correct in OpenGL but Cg fails to handle it properly. As a result
+	// -1 is used by Cg resulting (signedness incorrect) and compilation fails.
+	if (strstr((const char*)glGetString(GL_VENDOR), "ATI") == NULL) 
+	{
+		cgGLSetOptimalOptions(g_cgvProf);
+		cgGLSetOptimalOptions(g_cgfProf);
+	}
+#else
 	cgGLSetOptimalOptions(g_cgvProf);
 	cgGLSetOptimalOptions(g_cgfProf);
+#endif
 
 	INFO_LOG(VIDEO, "Max buffer sizes: %d %d", cgGetProgramBufferMaxSize(g_cgvProf), cgGetProgramBufferMaxSize(g_cgfProf));
 	int nenvvertparams, nenvfragparams, naddrregisters[2];
diff --git a/Source/Plugins/Plugin_VideoOGL/Src/VertexShaderCache.cpp b/Source/Plugins/Plugin_VideoOGL/Src/VertexShaderCache.cpp
index 87752e5f80..ed8ffbdcdf 100644
--- a/Source/Plugins/Plugin_VideoOGL/Src/VertexShaderCache.cpp
+++ b/Source/Plugins/Plugin_VideoOGL/Src/VertexShaderCache.cpp
@@ -111,7 +111,13 @@ void VertexShaderCache::Init()
 
 	s_displayCompileAlert = true;
 
-    glGetProgramivARB(GL_VERTEX_PROGRAM_ARB, GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB, (GLint *)&s_nMaxVertexInstructions);		
+	glGetProgramivARB(GL_VERTEX_PROGRAM_ARB, GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB, (GLint *)&s_nMaxVertexInstructions);		
+#ifdef __linux__
+	if (strstr((const char*)glGetString(GL_VENDOR), "ATI") != NULL)
+	{
+		s_nMaxVertexInstructions = 4096;
+	}
+#endif
 }
 
 void VertexShaderCache::Shutdown()