fix.diff sketch for DF-4411 — stop mutating the static model tables: apply
look-alike quirks to a per-instance copy in the softc.  Authored against the
read-only sys/ tree; never applied there.  fix_status: not_testable (no
ATK0100/ASUS010 firmware on the audit guest; see env.txt).

--- a/sys/dev/acpica/acpi_asus/acpi_asus.c
+++ b/sys/dev/acpica/acpi_asus/acpi_asus.c
@@ -116,6 +116,8 @@
 struct acpi_asus_softc {
 	device_t		dev;
 	ACPI_HANDLE		handle;
 	ACPI_HANDLE		lcdd_handle;
+	struct acpi_asus_model	model_copy;	/* per-instance; quirks land
+						 * here, not in the tables */
 
 	struct acpi_asus_model	*model;		/* == &sc->model_copy */
@@ -620,8 +622,11 @@
 	 */
 	for (model = acpi_asus_models; model->name != NULL; model++) {
 		if (strncmp(Obj->String.Pointer, model->name, 3) == 0) {
+			/* quirk the private copy, never the shared entry */
 good:
+			sc->model_copy = *model;
+			sc->model = &sc->model_copy;
+			model = sc->model;
 			sbuf_printf(sb, "Asus %s Laptop Extras",
 			    Obj->String.Pointer);
@@ -679,9 +684,9 @@
 		/* L2B is like L3C but has no lcd_get method */
 		else if (strncmp(model->name, "L3C", 3) == 0 &&
 		    strncmp(Obj->String.Pointer, "L2B", 3) == 0) {
-			model->lcd_get = NULL;
+			sc->model_copy.lcd_get = NULL;
 			goto good;
 		}
 
 		/* A3G is like M6R but with a different lcd_get method */
 		else if (strncmp(model->name, "M6R", 3) == 0 &&
 		    strncmp(Obj->String.Pointer, "A3G", 3) == 0) {
-			model->lcd_get = "\_SB.PCI0.P0P1.VGA.LCDG";
+			sc->model_copy.lcd_get = "\_SB.PCI0.P0P1.VGA.LCDG";
 			goto good;
 		}
 
 		/* M2N and W1N are like xxN with added WLED */
 		else if (strncmp(model->name, "xxN", 3) == 0 &&
 		    (strncmp(Obj->String.Pointer, "M2N", 3) == 0 ||
 		     strncmp(Obj->String.Pointer, "W1N", 3) == 0)) {
-			model->wled_set = "WLED";
+			sc->model_copy.wled_set = "WLED";
 			goto good;
 		}
 
 		/* M5N and S5N are like xxN without MLED */
 		else if (strncmp(model->name, "xxN", 3) == 0 &&
 		    (strncmp(Obj->String.Pointer, "M5N", 3) == 0 ||
 		     strncmp(Obj->String.Pointer, "S5N", 3) == 0)) {
-			model->mled_set = NULL;
+			sc->model_copy.mled_set = NULL;
 			goto good;
 		}
@@ -805,9 +810,10 @@
 	/* Handle notifies */
-	if (sc->model->n_func == NULL)
-		sc->model->n_func = acpi_asus_notify;
+	if (sc->model->n_func == NULL)
+		sc->model->n_func = acpi_asus_notify;	/* now hits the copy */
 
 	AcpiInstallNotifyHandler(sc->handle, ACPI_SYSTEM_NOTIFY,
 	    sc->model->n_func, dev);

(Combine with the DF-4409 fix so detach removes the handler recorded at
install time; Samsung/EeePC paths already point sc->model at their table
entries — switch those to sc->model_copy as well for uniformity, and make
the static tables const.)