diff --git a/engine/spatialpartition.cpp b/engine/spatialpartition.cpp
index 29689d03..0f96aaea 100644
--- a/engine/spatialpartition.cpp
+++ b/engine/spatialpartition.cpp
@@ -2447,10 +2447,10 @@ bool CVoxelTree::EnumerateElementsAlongRay_ExtrudedRay( SpatialPartitionListMask
 		return true;
 
 	// Setup.
-	int nStep[3];
-	float tMax[3];	// amount of change in t along ray until we hit the next new voxel
-	float tMin[3];	// amount of change in t along ray until we leave the last voxel
-	float tDelta[3];
+	int nStep[3] = {0, 0, 0};
+	float tMax[3] = {0.f, 0.f, 0.f};	// amount of change in t along ray until we hit the next new voxel
+	float tMin[3] = {0.f, 0.f, 0.f};	// amount of change in t along ray until we leave the last voxel
+	float tDelta[3] = {0.f, 0.f, 0.f};
 	m_pVoxelHash[0].LeafListExtrudedRaySetup( ray, vecInvDelta, vecMin, vecMax, voxelBounds[0][0], voxelBounds[0][1], nStep, tMin, tMax, tDelta );
 
 	int nLastVoxel1[3];
diff --git a/public/tier0/platform.h b/public/tier0/platform.h
index 30b2ec0f..83b48b98 100644
--- a/public/tier0/platform.h
+++ b/public/tier0/platform.h
@@ -1038,7 +1038,7 @@ inline T QWordSwapC( T dw )
 // The typically used methods.
 //-------------------------------------
 
-#if (defined(__i386__) || (defined(__arm__) && defined(ANDROID))) && !defined(VALVE_LITTLE_ENDIAN)
+#if (defined(__i386__) || defined(__amd64__) || (defined(__arm__) && defined(ANDROID))) && !defined(VALVE_LITTLE_ENDIAN)
 #define VALVE_LITTLE_ENDIAN 1
 #endif
 
diff --git a/public/togles/linuxwin/glentrypoints.h b/public/togles/linuxwin/glentrypoints.h
index 310932bc..33c23f0a 100644
--- a/public/togles/linuxwin/glentrypoints.h
+++ b/public/togles/linuxwin/glentrypoints.h
@@ -277,6 +277,9 @@ enum GLDriverProvider_t
 	cGLDriverProviderIntel,
 	cGLDriverProviderIntelOpenSource,
 	cGLDriverProviderApple,
+	cGLDriverProviderARM,
+	cGLDriverProviderQualcomm,
+	cGLDriverProviderImagination,
 
 	cGLTotalDriverProviders
 };
diff --git a/tier1/interface.cpp b/tier1/interface.cpp
index a4507fd4..aa701096 100644
--- a/tier1/interface.cpp
+++ b/tier1/interface.cpp
@@ -279,7 +279,7 @@ CSysModule *Sys_LoadModule( const char *pModuleName, Sys_Flags flags /* = SYS_NO
 	// prior to the call to this routine.
 	char szCwd[1024];
 #ifdef POSIX
-	char szModuleName[1024];
+	char szModuleName[1024] = { 0 };
 #endif
 	HMODULE hDLL = NULL;
 
diff --git a/togl/linuxwin/glmgr.cpp b/togl/linuxwin/glmgr.cpp
index 7e7d0dc4..cfe84114 100644
--- a/togl/linuxwin/glmgr.cpp
+++ b/togl/linuxwin/glmgr.cpp
@@ -2454,6 +2454,7 @@ static uint gPersistentBufferSize[kGLMNumBufferTypes] =
 
 GLMContext::GLMContext( IDirect3DDevice9 *pDevice, GLMDisplayParams *params )
 {
+	m_nNumDirtySamplers = 0;
 // 	m_bUseSamplerObjects = true;
 // 	
 // 	// On most AMD drivers (like the current latest, 12.10 Windows), the PCF depth comparison mode doesn't work on sampler objects, so just punt them.
diff --git a/togles/linuxwin/glentrypoints.cpp b/togles/linuxwin/glentrypoints.cpp
index 2d48c251..f341fd1d 100644
--- a/togles/linuxwin/glentrypoints.cpp
+++ b/togles/linuxwin/glentrypoints.cpp
@@ -365,6 +365,12 @@ COpenGLEntryPoints::COpenGLEntryPoints()
 		m_nDriverProvider = cGLDriverProviderIntelOpenSource;
 	else if ( V_stristr( m_pGLDriverStrings[cGLVendorString], "apple" ) )
 		m_nDriverProvider = cGLDriverProviderApple;
+	else if ( V_stristr( m_pGLDriverStrings[cGLVendorString], "qualcomm" ) )
+		m_nDriverProvider = cGLDriverProviderQualcomm;
+	else if ( V_stristr( m_pGLDriverStrings[cGLVendorString], "arm" ) )
+		m_nDriverProvider = cGLDriverProviderARM;
+	else if ( V_stristr( m_pGLDriverStrings[cGLVendorString], "imagination technologies" ) )
+		m_nDriverProvider = cGLDriverProviderImagination;
 
 	pszString = ( const char * )glGetString(GL_RENDERER);
 	m_pGLDriverStrings[cGLRendererString] = strdup( pszString ? pszString : "" );
diff --git a/togles/linuxwin/glmgr.cpp b/togles/linuxwin/glmgr.cpp
index 83bcf2e3..e7c9338f 100644
--- a/togles/linuxwin/glmgr.cpp
+++ b/togles/linuxwin/glmgr.cpp
@@ -2359,10 +2359,16 @@ static uint gPersistentBufferSize[kGLMNumBufferTypes] =
 
 GLMContext::GLMContext( IDirect3DDevice9 *pDevice, GLMDisplayParams *params )
 {
-	m_bUseSamplerObjects = true;
-	if ( CommandLine()->CheckParm( "-gl_disablesamplerobjects" ) )
+	m_nNumDirtySamplers = 0;
+
+	if( gGL->m_nDriverProvider == cGLDriverProviderARM )
+		m_bUseSamplerObjects = true;
+	else
 		m_bUseSamplerObjects = false;
 
+	if ( CommandLine()->CheckParm( "-gl_enablesamplerobjects" ) )
+		m_bUseSamplerObjects = true;
+
 	// Try to get some more free memory by relying on driver host copies instead of ours.
 	//  In some cases the driver will be able to discard their own host copy and rely on GPU
 	//  memory, reducing memory usage.