diff --git a/lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp b/lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp
index 1f7b0550e..75231dca8 100644
--- a/lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp
+++ b/lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp
@@ -580,7 +580,7 @@ static GLXContext getMeAGLContext(Display *display, GLXFBConfig glxFBConfig)
     irr::video::useCoreContext = false;
 	// fall back to legacy context
     os::Printer::log("Creating legacy OpenGL 2.1 context...", ELL_INFORMATION);
-	Context = glXCreateContextAttribsARB(display, glxFBConfig, 0, True, legacyctx);
+    Context = glXCreateNewContext(display, glxFBConfig, GLX_RGBA_TYPE, NULL, True);
 	return Context;
 }
 
diff --git a/src/graphics/post_processing.cpp b/src/graphics/post_processing.cpp
index 1aad3c6cd..12dabcf32 100644
--- a/src/graphics/post_processing.cpp
+++ b/src/graphics/post_processing.cpp
@@ -544,32 +544,6 @@ void PostProcessing::renderSSAO()
     DrawFullScreenEffect<FullScreenShader::SSAOShader>(irr_driver->getSSAORadius(), irr_driver->getSSAOK(), irr_driver->getSSAOSigma());
 }
 
-
-void PostProcessing::renderFog()
-{
-    const Track * const track = World::getWorld()->getTrack();
-
-    // This function is only called once per frame - thus no need for setters.
-    const float start = track->getFogStart();
-    const SColor tmpcol = track->getFogColor();
-
-    core::vector3df col( tmpcol.getRed() / 255.0f,
-        tmpcol.getGreen() / 255.0f,
-        tmpcol.getBlue() / 255.0f );
-
-    glDisable(GL_DEPTH_TEST);
-    glEnable(GL_BLEND);
-    glBlendEquation(GL_FUNC_ADD);
-    glBlendFunc(GL_ONE, GL_ONE);
-
-
-    FullScreenShader::FogShader::getInstance()->SetTextureUnits(irr_driver->getDepthStencilTexture());
-    DrawFullScreenEffect<FullScreenShader::FogShader>(1.f / (40.f * start), col);
-
-    glEnable(GL_DEPTH_TEST);
-    glDisable(GL_BLEND);
-}
-
 void PostProcessing::renderMotionBlur(unsigned cam, FrameBuffer &in_fbo, FrameBuffer &out_fbo)
 {
     MotionBlurProvider * const cb = (MotionBlurProvider *)irr_driver->
diff --git a/src/graphics/post_processing.hpp b/src/graphics/post_processing.hpp
index 1fea5e9c6..a33f3c19c 100644
--- a/src/graphics/post_processing.hpp
+++ b/src/graphics/post_processing.hpp
@@ -77,7 +77,6 @@ public:
     void         renderSunlight(const core::vector3df &direction, const video::SColorf &col);
     void         renderShadowedSunlight(const core::vector3df &direction, const video::SColorf &col, const std::vector<core::matrix4> &sun_ortho_matrix, unsigned depthtex);
 
-    void renderFog();
     void renderSSAO();
     void renderEnvMap(const float *bSHCoeff, const float *gSHCoeff, const float *rSHCoeff, unsigned skycubemap);
     void renderRHDebug(unsigned SHR, unsigned SHG, unsigned SHB, const core::matrix4 &rh_matrix, const core::vector3df &rh_extend);
diff --git a/src/graphics/render_lighting.cpp b/src/graphics/render_lighting.cpp
index 0aafd69ad..e841f7fc6 100644
--- a/src/graphics/render_lighting.cpp
+++ b/src/graphics/render_lighting.cpp
@@ -190,35 +190,42 @@ void IrrDriver::renderLightsScatter(unsigned pointlightcount)
     getFBO(FBO_HALF1).Bind();
     glClearColor(0., 0., 0., 0.);
     glClear(GL_COLOR_BUFFER_BIT);
-    m_post_processing->renderFog();
-
-    glEnable(GL_BLEND);
-    glBlendEquation(GL_FUNC_ADD);
-    glBlendFunc(GL_ONE, GL_ONE);
-    glEnable(GL_DEPTH_TEST);
-    glDepthMask(GL_FALSE);
 
     const Track * const track = World::getWorld()->getTrack();
 
-    const float start = track->getFogStart();
-    core::vector3df col(1., 1., 1.);
+    // This function is only called once per frame - thus no need for setters.
+    float start = track->getFogStart() + .001;
+    const video::SColor tmpcol = track->getFogColor();
+
+    core::vector3df col(tmpcol.getRed() / 255.0f,
+        tmpcol.getGreen() / 255.0f,
+        tmpcol.getBlue() / 255.0f);
+
+    glDisable(GL_DEPTH_TEST);
+    glDepthMask(GL_FALSE);
+    glEnable(GL_BLEND);
+    glBlendEquation(GL_FUNC_ADD);
+    glBlendFunc(GL_ONE, GL_ONE);
+
+    FullScreenShader::FogShader::getInstance()->SetTextureUnits(irr_driver->getDepthStencilTexture());
+    DrawFullScreenEffect<FullScreenShader::FogShader>(1.f / (40.f * start), col);
+
+    glEnable(GL_DEPTH_TEST);
+    core::vector3df col2(1., 1., 1.);
 
     glUseProgram(LightShader::PointLightScatterShader::getInstance()->Program);
     glBindVertexArray(LightShader::PointLightScatterShader::getInstance()->vao);
 
     LightShader::PointLightScatterShader::getInstance()->SetTextureUnits(irr_driver->getDepthStencilTexture());
-    LightShader::PointLightScatterShader::getInstance()->setUniforms(1.f / (40.f * start), col);
+    LightShader::PointLightScatterShader::getInstance()->setUniforms(1.f / (40.f * start), col2);
 
     glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, MIN2(pointlightcount, MAXLIGHT));
 
-// ***
-// That might be a performance issue but if disabled the quality is severly affected (the picture looks jagged)
-// It should be an option if there is a gain in FPS
     glDisable(GL_BLEND);
     m_post_processing->renderGaussian6Blur(getFBO(FBO_HALF1), getFBO(FBO_HALF2), 5., 5.);
     glEnable(GL_BLEND);
-// ***
 
+    glDisable(GL_DEPTH_TEST);
     glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
     getFBO(FBO_COLORS).Bind();
     m_post_processing->renderPassThrough(getRenderTargetTexture(RTT_HALF1));
diff --git a/src/graphics/render_skybox.cpp b/src/graphics/render_skybox.cpp
index a83c09182..66bb07d05 100644
--- a/src/graphics/render_skybox.cpp
+++ b/src/graphics/render_skybox.cpp
@@ -380,6 +380,7 @@ void IrrDriver::renderSkybox(const scene::ICameraSceneNode *camera)
     if (SkyboxTextures.empty())
         return;
     glBindVertexArray(MeshShader::SkyboxShader::getInstance()->cubevao);
+    glEnable(GL_DEPTH_TEST);
     glDisable(GL_CULL_FACE);
     assert(SkyboxTextures.size() == 6);
 
diff --git a/src/guiengine/widgets/icon_button_widget.cpp b/src/guiengine/widgets/icon_button_widget.cpp
index 0535b37db..f550bcd79 100644
--- a/src/guiengine/widgets/icon_button_widget.cpp
+++ b/src/guiengine/widgets/icon_button_widget.cpp
@@ -300,6 +300,7 @@ const video::ITexture* IconButtonWidget::getTexture()
 // -----------------------------------------------------------------------------
 video::ITexture* IconButtonWidget::getDeactivatedTexture(video::ITexture* texture)
 {
+#ifdef DO_NOT_USE_IT_CAUSES_BUG_1780_FONT_CORRUPTION
     video::ITexture* t;
 
     std::string name = texture->getName().getPath().c_str();
@@ -332,6 +333,8 @@ video::ITexture* IconButtonWidget::getDeactivatedTexture(video::ITexture* textur
     }
 
     return t;
+#endif
+    return texture;
 }
 
 // -----------------------------------------------------------------------------