--- ./hw/xfree86/os-support/shared/posix_tty.c.orig
+++ ./hw/xfree86/os-support/shared/posix_tty.c
@@ -460,7 +460,8 @@
 {
 	fd_set fds;
 	struct timeval timeout;
-	char c[4];
+	/* this needs to be big enough to flush an evdev event. */
+	char c[256];
 
 	DebugF("FlushingSerial\n");
 	if (tcflush(fd, TCIFLUSH) == 0)