# --- T2-COPYRIGHT-BEGIN ---
# t2/package/*/tinyx/add-shadow.patch
# Copyright (C) 2026 The T2 SDE Project
# SPDX-License-Identifier: GPL-2.0 or patched project license
# --- T2-COPYRIGHT-END ---

diff --git a/kdrive/fbdev/fbdev.c b/kdrive/fbdev/fbdev.c
index ae89381..3f8666d 100644
--- a/kdrive/fbdev/fbdev.c
+++ b/kdrive/fbdev/fbdev.c
@@ -32,6 +32,7 @@
 extern int KdTsPhyScreen;
 
 const char *fbdevDevicePath = NULL;
+Bool fbdevForceShadow = FALSE;
 
 static Bool fbdevMapFramebuffer(KdScreenInfo * screen);
 
@@ -317,7 +318,7 @@ static Bool fbdevMapFramebuffer(KdScreenInfo * screen)
 	KdMouseMatrix m;
 	FbdevPriv *priv = screen->card->driver;
 
-	if (scrpriv->randr != RR_Rotate_0 ||
+	if (fbdevForceShadow || scrpriv->randr != RR_Rotate_0 ||
 		priv->fix.type != FB_TYPE_PACKED_PIXELS)
 		scrpriv->shadow = TRUE;
 	else
diff --git a/kdrive/fbdev/fbdev.h b/kdrive/fbdev/fbdev.h
index ae4cb91..fa06625 100644
--- a/kdrive/fbdev/fbdev.h
+++ b/kdrive/fbdev/fbdev.h
@@ -48,6 +48,7 @@ typedef struct _fbdevScrPriv {
 } FbdevScrPriv;
 
 extern const char *fbdevDevicePath;
+extern Bool fbdevForceShadow;
 
 Bool fbdevCardInit(KdCardInfo * card);
 
diff --git a/kdrive/fbdev/fbinit.c b/kdrive/fbdev/fbinit.c
index 7be0190..f3da344 100644
--- a/kdrive/fbdev/fbinit.c
+++ b/kdrive/fbdev/fbinit.c
@@ -76,6 +76,8 @@ void ddxUseMsg(void)
 	ErrorF("\nXfbdev Device Usage:\n");
 	ErrorF
 	    ("-fb path         Framebuffer device to use. Defaults to /dev/fb0\n");
+	ErrorF
+	    ("-shadow          Render to a cached shadow buffer, flush dirty rects to fb\n");
 	ErrorF("\n");
 }
 
@@ -96,5 +98,10 @@ int ddxProcessArgument(int argc, char **argv, int i)
 		exit(1);
 	}
 
+	if (!strcmp(argv[i], "-shadow")) {
+		fbdevForceShadow = TRUE;
+		return 1;
+	}
+
 	return KdProcessArgument(argc, argv, i);
 }