Index: sys/compat/linux/linux_ioctl.h
===================================================================
--- sys/compat/linux/linux_ioctl.h
+++ sys/compat/linux/linux_ioctl.h
@@ -435,6 +435,7 @@
 #define	LINUX_VWERASE		14
 #define	LINUX_VLNEXT		15
 #define	LINUX_VEOL2		16
+#define	LINUX_VSTATUS		18
 #define	LINUX_NCCS		19
 
 #define	LINUX_POSIX_VDISABLE	'\0'
Index: sys/compat/linux/linux_ioctl.c
===================================================================
--- sys/compat/linux/linux_ioctl.c
+++ sys/compat/linux/linux_ioctl.c
@@ -500,6 +500,8 @@
 	lios->c_cc[LINUX_VDISCARD] = bios->c_cc[VDISCARD];
 	lios->c_cc[LINUX_VWERASE] = bios->c_cc[VWERASE];
 	lios->c_cc[LINUX_VLNEXT] = bios->c_cc[VLNEXT];
+	if (linux_preserve_vstatus)
+		lios->c_cc[LINUX_VSTATUS] = bios->c_cc[VSTATUS];
 
 	for (i=0; i<LINUX_NCCS; i++) {
 		if (i != LINUX_VMIN && i != LINUX_VTIME &&
@@ -614,6 +616,8 @@
 	bios->c_cc[VDISCARD] = lios->c_cc[LINUX_VDISCARD];
 	bios->c_cc[VWERASE] = lios->c_cc[LINUX_VWERASE];
 	bios->c_cc[VLNEXT] = lios->c_cc[LINUX_VLNEXT];
+	if (linux_preserve_vstatus)
+		bios->c_cc[VSTATUS] = lios->c_cc[LINUX_VSTATUS];
 
 	for (i=0; i<NCCS; i++) {
 		if (i != VMIN && i != VTIME &&
@@ -743,7 +747,10 @@
 		    td));
 		break;
 
-	/* LINUX_TCSBRK */
+	case LINUX_TCSBRK:
+		args->cmd = TIOCSBRK;
+		error = (sys_ioctl(td, (struct ioctl_args *)args));
+		break;
 
 	case LINUX_TCXONC: {
 		switch (args->arg) {
Index: sys/compat/linux/linux_mib.h
===================================================================
--- sys/compat/linux/linux_mib.h
+++ sys/compat/linux/linux_mib.h
@@ -62,4 +62,6 @@
 
 #define	linux_use26(t)		(linux_kernver(t) >= LINUX_KERNVER_2006000)
 
+extern int linux_preserve_vstatus;
+
 #endif /* _LINUX_MIB_H_ */
Index: sys/compat/linux/linux_mib.c
===================================================================
--- sys/compat/linux/linux_mib.c
+++ sys/compat/linux/linux_mib.c
@@ -62,6 +62,10 @@
 
 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0, "Linux mode");
 
+int linux_preserve_vstatus = 0;
+SYSCTL_INT(_compat_linux, OID_AUTO, preserve_vstatus, CTLFLAG_RWTUN,
+    &linux_preserve_vstatus, 0, "Preserve VSTATUS termios(4) flag");
+
 static int	linux_set_osname(struct thread *td, char *osname);
 static int	linux_set_osrelease(struct thread *td, char *osrelease);
 static int	linux_set_oss_version(struct thread *td, int oss_version);