diff --git a/Common/GPU/Vulkan/thin3d_vulkan.cpp b/Common/GPU/Vulkan/thin3d_vulkan.cpp
index ba3bc05897..36f480a645 100644
--- a/Common/GPU/Vulkan/thin3d_vulkan.cpp
+++ b/Common/GPU/Vulkan/thin3d_vulkan.cpp
@@ -215,7 +215,7 @@ bool VKShaderModule::Compile(VulkanContext *vulkan, ShaderLanguage language, con
 	std::vector<uint32_t> spirv;
 	std::string errorMessage;
 	if (!GLSLtoSPV(vkstage_, source_.c_str(), GLSLVariant::VULKAN, spirv, &errorMessage)) {
-		INFO_LOG(G3D, "Shader compile to module failed: %s", errorMessage.c_str());
+		WARN_LOG(G3D, "Shader compile to module failed: %s", errorMessage.c_str());
 		return false;
 	}
 
@@ -231,6 +231,7 @@ bool VKShaderModule::Compile(VulkanContext *vulkan, ShaderLanguage language, con
 	if (vulkan->CreateShaderModule(spirv, &module_)) {
 		ok_ = true;
 	} else {
+		WARN_LOG(G3D, "vkCreateShaderModule failed");
 		ok_ = false;
 	}
 	return ok_;
@@ -1281,7 +1282,7 @@ ShaderModule *VKContext::CreateShaderModule(ShaderStage stage, ShaderLanguage la
 	if (shader->Compile(vulkan_, language, data, size)) {
 		return shader;
 	} else {
-		ERROR_LOG(G3D,  "Failed to compile shader: %s", (const char *)data);
+		ERROR_LOG(G3D,  "Failed to compile shader:\n%s", (const char *)data);
 		shader->Release();
 		return nullptr;
 	}
diff --git a/UI/GPUDriverTestScreen.cpp b/UI/GPUDriverTestScreen.cpp
index 3c27a8ee0d..7f0773971a 100644
--- a/UI/GPUDriverTestScreen.cpp
+++ b/UI/GPUDriverTestScreen.cpp
@@ -82,16 +82,12 @@ static const std::vector<Draw::ShaderSource> fsAdrenoLogicTest = {
 	R"(#version 450
 	#extension GL_ARB_separate_shader_objects : enable
 	#extension GL_ARB_shading_language_420pack : enable
-	precision lowp float;
-	layout(location = 0) flat in lowp vec4 oColor0;
+	layout(location = 0) in vec4 oColor0;
 	layout(location = 1) in highp vec2 oTexCoord0;
 	layout(location = 0) out vec4 fragColor0;
 	layout(set = 0, binding = 1) uniform sampler2D Sampler0;
 	void main() {
-		vec4 t = texture(Sampler0, oTexCoord0).aaaa;
-		vec4 p = oColor0;
-		vec4 v = p * t;
-		v.rgb = clamp(v.rgb * 2.0, 0.0, 1.0);
+		vec4 v = texture(Sampler0, oTexCoord0).aaaa * oColor0;
 		if (v.r < 0.2 && v.g < 0.2 && v.b < 0.2) discard;
 		fragColor0 = vec4(0.0, 1.0, 0.0, 1.0);
 	})"
@@ -126,7 +122,7 @@ static const std::vector<Draw::ShaderSource> vsAdrenoLogicTest = {
 	"layout (location = 0) in vec4 pos;\n"
 	"layout (location = 1) in vec4 inColor;\n"
 	"layout (location = 2) in vec2 inTexCoord;\n"
-	"layout (location = 0) out lowp vec4 outColor;\n"
+	"layout (location = 0) out vec4 outColor;\n"
 	"layout (location = 1) out highp vec2 outTexCoord;\n"
 	"out gl_PerVertex { vec4 gl_Position; };\n"
 	"void main() {\n"