Index: uspace/drv/uhci-hcd/batch.c
===================================================================
--- uspace/drv/uhci-hcd/batch.c	(revision 3de48b510b1d85e0126b1adb9ecc3206e0c4e1dc)
+++ uspace/drv/uhci-hcd/batch.c	(revision 48563a3d983e5ddcf788def5bb1744d42b56d2af)
@@ -140,5 +140,5 @@
 {
 	assert(instance);
-	usb_log_debug2("Checking(%p) %d packet for completion.\n",
+	usb_log_debug2("Batch(%p) checking %d packet(s) for completion.\n",
 	    instance, instance->packets);
 	instance->transfered_size = 0;
@@ -152,4 +152,6 @@
 			if (i > 0)
 				instance->transfered_size -= instance->setup_size;
+			usb_log_debug("Batch(%p) found error TD(%d):%x.\n",
+			  instance, i, instance->tds[i].status);
 			return true;
 		}
@@ -297,6 +299,7 @@
 
 	int err = instance->error;
-	usb_log_info("Callback IN(%d): %s(%d), %zu.\n", instance->transfer_type,
-	    str_error(err), err, instance->transfered_size);
+	usb_log_info("Batch(%p) callback IN(type:%d): %s(%d), %zu.\n",
+	    instance, instance->transfer_type, str_error(err), err,
+	    instance->transfered_size);
 
 	instance->callback_in(instance->fun,
@@ -311,5 +314,6 @@
 
 	int err = instance->error;
-	usb_log_info("Callback OUT(%d): %d.\n", instance->transfer_type, err);
+	usb_log_info("Batch(%p) callback OUT(type:%d): %s(%d).\n",
+	    instance, instance->transfer_type, str_error(err), err);
 	instance->callback_out(instance->fun,
 	    err, instance->arg);
@@ -320,5 +324,5 @@
 	assert(instance);
 	batch_call_in(instance);
-	usb_log_debug("Disposing batch: %p.\n", instance);
+	usb_log_debug("Batch(%p) disposing.\n", instance);
 	free32(instance->tds);
 	free32(instance->qh);
@@ -332,5 +336,5 @@
 	assert(instance);
 	batch_call_out(instance);
-	usb_log_debug("Disposing batch: %p.\n", instance);
+	usb_log_debug("Batch(%p) disposing.\n", instance);
 	free32(instance->tds);
 	free32(instance->qh);
Index: uspace/drv/uhci-hcd/iface.c
===================================================================
--- uspace/drv/uhci-hcd/iface.c	(revision 3de48b510b1d85e0126b1adb9ecc3206e0c4e1dc)
+++ uspace/drv/uhci-hcd/iface.c	(revision 48563a3d983e5ddcf788def5bb1744d42b56d2af)
@@ -110,4 +110,7 @@
 	usb_speed_t speed = device_keeper_speed(&hc->device_manager, target.address);
 
+	usb_log_debug("Interrupt OUT %d:%d %zu(%zu).\n",
+	    target.address, target.endpoint, size, max_packet_size);
+
 	batch_t *batch = batch_get(fun, target, USB_TRANSFER_INTERRUPT,
 	    max_packet_size, speed, data, size, NULL, 0, NULL, callback, arg);
@@ -119,6 +122,5 @@
 /*----------------------------------------------------------------------------*/
 static int interrupt_in(ddf_fun_t *fun, usb_target_t target,
-    size_t max_packet_size,
-    void *data, size_t size,
+    size_t max_packet_size, void *data, size_t size,
     usbhc_iface_transfer_in_callback_t callback, void *arg)
 {
@@ -127,4 +129,6 @@
 	assert(hc);
 	usb_speed_t speed = device_keeper_speed(&hc->device_manager, target.address);
+	usb_log_debug("Interrupt IN %d:%d %zu(%zu).\n",
+	    target.address, target.endpoint, size, max_packet_size);
 
 	batch_t *batch = batch_get(fun, target, USB_TRANSFER_INTERRUPT,
Index: uspace/drv/uhci-hcd/uhci.c
===================================================================
--- uspace/drv/uhci-hcd/uhci.c	(revision 3de48b510b1d85e0126b1adb9ecc3206e0c4e1dc)
+++ uspace/drv/uhci-hcd/uhci.c	(revision 48563a3d983e5ddcf788def5bb1744d42b56d2af)
@@ -304,5 +304,6 @@
 	while (1) {
 		uint16_t status = pio_read_16(&instance->registers->usbsts);
-//		usb_log_debug2("UHCI status: %x.\n", status);
+		if (status != 0)
+			usb_log_debug2("UHCI status: %x.\n", status);
 		status |= 1;
 		uhci_interrupt(instance, status);