Index: uspace/drv/ohci/root_hub.c
===================================================================
--- uspace/drv/ohci/root_hub.c	(revision 44b1674ec560a7cde85edaf566ac5467993d0963)
+++ uspace/drv/ohci/root_hub.c	(revision 9014dcdb77df4d415fce62b2bfc7796b796b2ff2)
@@ -217,4 +217,5 @@
 	instance->registers->rh_desc_a |= RHDA_NPS_FLAG;
 	instance->unfinished_interrupt_transfer = NULL;
+	instance->interrupt_buffer = malloc((instance->port_count + 8)/8);
 	usb_log_info("OHCI root hub with %d ports.\n", instance->port_count);
 	return EOK;
@@ -471,7 +472,7 @@
 	size_t * buffer_size) {
 	int bit_count = instance->port_count + 1;
-	(*buffer_size) = (bit_count / 8) + ((bit_count % 8 == 0) ? 0 : 1);
-
-	(*buffer) = malloc(*buffer_size);
+	(*buffer_size) = (bit_count+7 / 8);
+
+	(*buffer) = instance->interrupt_buffer;//malloc(*buffer_size);
 	uint8_t * bitmap = (uint8_t*) (*buffer);
 	uint32_t mask = (1 << (USB_HUB_FEATURE_C_HUB_LOCAL_POWER + 16))
Index: uspace/drv/ohci/root_hub.h
===================================================================
--- uspace/drv/ohci/root_hub.h	(revision 44b1674ec560a7cde85edaf566ac5467993d0963)
+++ uspace/drv/ohci/root_hub.h	(revision 9014dcdb77df4d415fce62b2bfc7796b796b2ff2)
@@ -56,4 +56,10 @@
 	/** interrupt transfer waiting for an actual interrupt to occur */
 	usb_transfer_batch_t * unfinished_interrupt_transfer;
+	/** pre-allocated interrupt mask
+	 *
+	 * This is allocated when initializing instance, so that memory
+	 * allocation is not needed when processing request.
+	 */
+	uint8_t * interrupt_buffer;
 } rh_t;
 
Index: uspace/drv/usbhub/usbhub.c
===================================================================
--- uspace/drv/usbhub/usbhub.c	(revision 44b1674ec560a7cde85edaf566ac5467993d0963)
+++ uspace/drv/usbhub/usbhub.c	(revision 9014dcdb77df4d415fce62b2bfc7796b796b2ff2)
@@ -173,5 +173,5 @@
 leave:
 	/* FIXME: proper interval. */
-	async_usleep(1000 * 1000 * 10);
+	async_usleep(1000 * 250);
 
 	return true;
@@ -249,20 +249,20 @@
 	    sizeof (usb_hub_port_t) * (hub_info->port_count + 1));
 	size_t port;
-	for (port = 0; port < hub_info->port_count + 1; port++) {
+	for (port = 0; port < hub_info->port_count + 1; ++port) {
 		usb_hub_port_init(&hub_info->ports[port]);
 	}
 	if(is_power_switched){
 		usb_log_debug("is_power_switched\n");
-		if(has_individual_port_powering){
-			usb_log_debug("has_individual_port_powering\n");
-			for (port = 0; port < hub_info->port_count; port++) {
-				opResult = usb_hub_set_port_feature(hub_info->control_pipe,
-				    port+1, USB_HUB_FEATURE_PORT_POWER);
-				if (opResult != EOK) {
-					usb_log_error("cannot power on port %zu: %s.\n",
-					    port+1, str_error(opResult));
-				}
+		
+		for (port = 1; port <= hub_info->port_count; ++port) {
+			usb_log_debug("powering port %d\n",port);
+			opResult = usb_hub_set_port_feature(hub_info->control_pipe,
+			    port, USB_HUB_FEATURE_PORT_POWER);
+			if (opResult != EOK) {
+				usb_log_error("cannot power on port %zu: %s.\n",
+				    port, str_error(opResult));
 			}
-		}else{
+		}
+		if(!has_individual_port_powering){
 			usb_log_debug("!has_individual_port_powering\n");
 			opResult = usb_hub_set_feature(hub_info->control_pipe,
@@ -409,5 +409,5 @@
     usb_hub_status_t status) {
 	int opResult;
-	if (usb_hub_is_status(status,USB_HUB_FEATURE_HUB_LOCAL_POWER)) {
+	if (!usb_hub_is_status(status,USB_HUB_FEATURE_HUB_LOCAL_POWER)) {
 		//restart power on hub
 		opResult = usb_hub_set_feature(hub_info->control_pipe,
@@ -419,5 +419,5 @@
 	} else {//power reestablished on hub- restart ports
 		size_t port;
-		for (port = 0; port < hub_info->port_count; ++port) {
+		for (port = 1; port <= hub_info->port_count; ++port) {
 			opResult = usb_hub_set_port_feature(
 			    hub_info->control_pipe,
@@ -428,4 +428,11 @@
 			}
 		}
+		opResult = usb_hub_clear_feature(hub_info->control_pipe,
+		    USB_HUB_FEATURE_C_HUB_LOCAL_POWER);
+		if (opResult != EOK) {
+			usb_log_error("cannnot clear hub power change flag: "
+			    "%d\n",
+			    opResult);
+		}
 	}
 	return opResult;