Index: uspace/drv/char/ns8250/ns8250.c
===================================================================
--- uspace/drv/char/ns8250/ns8250.c	(revision 91ecaa1074636a3d3b17808616e1c5a4979a1928)
+++ uspace/drv/char/ns8250/ns8250.c	(revision e0cd9042bd95d0006a827f26b185b9dd150fcde2)
@@ -82,4 +82,6 @@
 /** Interrupt ID Register definition. */
 #define	NS8250_IID_ACTIVE	(1 << 0)
+#define NS8250_IID_CAUSE_MASK 0x0e
+#define NS8250_IID_CAUSE_RXSTATUS 0x06
 
 /** FIFO Control Register definition. */
@@ -466,5 +468,5 @@
 {
 	/* Interrupt when data received. */
-	pio_write_8(&regs->ier, NS8250_IER_RXREADY);
+	pio_write_8(&regs->ier, NS8250_IER_RXREADY | NS8250_IER_RXSTATUS);
 	pio_write_8(&regs->mcr, NS8250_MCR_DTR | NS8250_MCR_RTS 
 	    | NS8250_MCR_OUT2);
@@ -504,4 +506,7 @@
 	async_msg_1(exch, IRC_ENABLE_INTERRUPT, ns->irq);
 	async_exchange_end(exch);
+
+	/* Read LSR to clear possible previous LSR interrupt */
+	pio_read_8(&ns->regs->lsr);
 
 	/* Enable interrupt on the serial port. */
@@ -766,6 +771,7 @@
 /** The interrupt handler.
  *
- * The serial port is initialized to interrupt when some data come, so the
- * interrupt is handled by reading the incomming data.
+ * The serial port is initialized to interrupt when some data come or line
+ * status register changes, so the interrupt is handled by reading the incoming
+ * data and reading the line status register.
  *
  * @param dev		The serial port device.
@@ -774,5 +780,15 @@
     ipc_call_t *icall)
 {
-	ns8250_read_from_device(NS8250_FROM_DEV(dev));
+	ns8250_t *ns = NS8250_FROM_DEV(dev);
+
+	uint8_t iir = pio_read_8(&ns->regs->iid);
+	if ((iir & NS8250_IID_CAUSE_MASK) == NS8250_IID_CAUSE_RXSTATUS) {
+		uint8_t lsr = pio_read_8(&ns->regs->lsr);
+		if (lsr & NS8250_LSR_OE) {
+			ddf_msg(LVL_WARN, "Overrun error on %s", ns->dev->name);
+		}
+	}
+	
+	ns8250_read_from_device(ns);
 }