diff --git a/src/posix/cocoa/i_video.mm b/src/posix/cocoa/i_video.mm
index ff4730dc4..c15a1727c 100644
--- a/src/posix/cocoa/i_video.mm
+++ b/src/posix/cocoa/i_video.mm
@@ -108,7 +108,7 @@ EXTERN_CVAR(Bool, ticker   )
 EXTERN_CVAR(Bool, vid_vsync)
 EXTERN_CVAR(Bool, vid_hidpi)
 
-CUSTOM_CVAR(Bool, swtruecolor, true, CVAR_ARCHIVE | CVAR_GLOBALCONFIG | CVAR_NOINITCALL)
+CUSTOM_CVAR(Bool, swtruecolor, false, CVAR_ARCHIVE | CVAR_GLOBALCONFIG | CVAR_NOINITCALL)
 {
 	// Strictly speaking this doesn't require a mode switch, but it is the easiest
 	// way to force a CreateFramebuffer call without a lot of refactoring.
@@ -122,7 +122,7 @@ CUSTOM_CVAR(Bool, swtruecolor, true, CVAR_ARCHIVE | CVAR_GLOBALCONFIG | CVAR_NOI
 	}
 }
 
-CUSTOM_CVAR(Bool, fullscreen, true, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
+CUSTOM_CVAR(Bool, fullscreen, false, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 {
 	extern int NewWidth, NewHeight, NewBits, DisplayBits;
 
diff --git a/src/posix/sdl/hardware.cpp b/src/posix/sdl/hardware.cpp
index 1fe4c6bd0..74822e39e 100644
--- a/src/posix/sdl/hardware.cpp
+++ b/src/posix/sdl/hardware.cpp
@@ -323,7 +323,7 @@ CUSTOM_CVAR (Int, vid_maxfps, 200, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 
 extern int NewWidth, NewHeight, NewBits, DisplayBits;
 
-CUSTOM_CVAR(Bool, swtruecolor, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG|CVAR_NOINITCALL)
+CUSTOM_CVAR(Bool, swtruecolor, false, CVAR_ARCHIVE|CVAR_GLOBALCONFIG|CVAR_NOINITCALL)
 {
 	// Strictly speaking this doesn't require a mode switch, but it is the easiest
 	// way to force a CreateFramebuffer call without a lot of refactoring.
@@ -336,7 +336,7 @@ CUSTOM_CVAR(Bool, swtruecolor, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG|CVAR_NOINITC
 	}
 }
 
-CUSTOM_CVAR (Bool, fullscreen, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG|CVAR_NOINITCALL)
+CUSTOM_CVAR (Bool, fullscreen, false, CVAR_ARCHIVE|CVAR_GLOBALCONFIG|CVAR_NOINITCALL)
 {
 	NewWidth = screen->VideoWidth;
 	NewHeight = screen->VideoHeight;
diff --git a/src/swrenderer/drawers/r_draw.cpp b/src/swrenderer/drawers/r_draw.cpp
index bb237f0fb..0b5126c53 100644
--- a/src/swrenderer/drawers/r_draw.cpp
+++ b/src/swrenderer/drawers/r_draw.cpp
@@ -52,7 +52,7 @@
 #include "r_thread.h"
 #include "swrenderer/scene/r_light.h"
 
-CVAR(Bool, r_dynlights, 1, CVAR_ARCHIVE | CVAR_GLOBALCONFIG);
+CVAR(Bool, r_dynlights, 0, CVAR_ARCHIVE | CVAR_GLOBALCONFIG);
 CVAR(Bool, r_fuzzscale, 1, CVAR_ARCHIVE | CVAR_GLOBALCONFIG);
 
 namespace swrenderer
diff --git a/src/win32/hardware.cpp b/src/win32/hardware.cpp
index 584601794..ebed91b6b 100644
--- a/src/win32/hardware.cpp
+++ b/src/win32/hardware.cpp
@@ -427,7 +427,7 @@ void I_RestoreWindowedPos ()
 
 extern int NewWidth, NewHeight, NewBits, DisplayBits;
 
-CUSTOM_CVAR(Bool, swtruecolor, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG|CVAR_NOINITCALL)
+CUSTOM_CVAR(Bool, swtruecolor, false, CVAR_ARCHIVE|CVAR_GLOBALCONFIG|CVAR_NOINITCALL)
 {
 	// Strictly speaking this doesn't require a mode switch, but it is the easiest
 	// way to force a CreateFramebuffer call without a lot of refactoring.