diff --git a/driver-icarus.c b/driver-icarus.c
index a42988bb..6ac1a0bf 100644
--- a/driver-icarus.c
+++ b/driver-icarus.c
@@ -74,6 +74,7 @@ ASSERT1(sizeof(uint32_t) == 4);
 
 // USB ms timeout to wait - user specified timeouts are multiples of this
 #define ICARUS_WAIT_TIMEOUT 100
+#define ICARUS_CMR2_TIMEOUT 1
 
 // Defined in multiples of ICARUS_WAIT_TIMEOUT
 // Must of course be greater than ICARUS_READ_COUNT_TIMING/ICARUS_WAIT_TIMEOUT
@@ -186,6 +187,8 @@ struct ICARUS_INFO {
 	struct ICARUS_HISTORY history[INFO_HISTORY+1];
 	uint32_t min_data_count;
 
+	int timeout;
+
 	// seconds per Hash
 	double Hs;
 	// ms til we abort
@@ -434,7 +437,7 @@ static int icarus_get_nonce(struct cgpu_info *icarus, unsigned char *buf, struct
 	struct ICARUS_INFO *info = (struct ICARUS_INFO *)(icarus->device_data);
 	struct timeval read_start, read_finish;
 	int err, amt;
-	int rc = 0;
+	int rc = 0, delay;
 	int read_amount = ICARUS_READ_SIZE;
 	bool first = true;
 
@@ -446,7 +449,7 @@ static int icarus_get_nonce(struct cgpu_info *icarus, unsigned char *buf, struct
 		cgtime(&read_start);
 		err = usb_read_ii_timeout(icarus, info->intinfo,
 					  (char *)buf, read_amount, &amt,
-					  ICARUS_WAIT_TIMEOUT, C_GETRESULTS);
+					  info->timeout, C_GETRESULTS);
 		cgtime(&read_finish);
 		if (err < 0 && err != LIBUSB_ERROR_TIMEOUT) {
 			applog(LOG_ERR, "%s%i: Comms error (rerr=%d amt=%d)",
@@ -471,10 +474,7 @@ static int icarus_get_nonce(struct cgpu_info *icarus, unsigned char *buf, struct
 		}
 
 		if (thr && thr->work_restart) {
-			if (opt_debug) {
-				applog(LOG_DEBUG,
-					"Icarus Read: Work restart at %d ms", rc);
-			}
+			applog(LOG_DEBUG, "Icarus Read: Work restart at %d ms", rc);
 			return ICA_NONCE_RESTART;
 		}
 
@@ -483,6 +483,18 @@ static int icarus_get_nonce(struct cgpu_info *icarus, unsigned char *buf, struct
 			read_amount -= amt;
 			first = false;
 		}
+
+		if (info->timeout < ICARUS_WAIT_TIMEOUT) {
+			delay = ICARUS_WAIT_TIMEOUT - rc;
+			if (delay > 0) {
+				cgsleep_ms(delay);
+
+				if (thr && thr->work_restart) {
+					applog(LOG_DEBUG, "Icarus Read: Work restart at %d ms", rc);
+					return ICA_NONCE_RESTART;
+				}
+			}
+		}
 	}
 }
 
@@ -796,6 +808,7 @@ static bool icarus_detect_one(struct libusb_device *dev, struct usb_find_devices
 	int baud, uninitialised_var(work_division), uninitialised_var(fpga_count);
 	struct cgpu_info *icarus;
 	int ret, err, amount, tries;
+	enum sub_ident ident;
 	bool ok;
 
 	icarus = usb_alloc_cgpu(&icarus_drv, 1);
@@ -814,6 +827,23 @@ static bool icarus_detect_one(struct libusb_device *dev, struct usb_find_devices
 		quit(1, "Failed to malloc ICARUS_INFO");
 	icarus->device_data = (void *)info;
 
+	ident = usb_ident(icarus);
+	switch (ident) {
+		case IDENT_ICA:
+		case IDENT_BLT:
+		case IDENT_LLT:
+		case IDENT_AMU:
+		case IDENT_CMR1:
+			info->timeout = ICARUS_WAIT_TIMEOUT;
+			break;
+		case IDENT_CMR2:
+			info->timeout = ICARUS_CMR2_TIMEOUT;
+			break;
+		default:
+			quit(1, "%s icarus_detect_one() invalid %s ident=%d",
+				icarus->drv->dname, icarus->drv->dname, ident);
+	}
+
 	tries = 2;
 	ok = false;
 	while (!ok && tries-- > 0) {
@@ -1019,12 +1049,10 @@ static int64_t icarus_scanhash(struct thr_info *thr, struct work *work,
 		if (unlikely(estimate_hashes > 0xffffffff))
 			estimate_hashes = 0xffffffff;
 
-		if (opt_debug) {
-			applog(LOG_DEBUG, "%s%d: no nonce = 0x%08lX hashes (%ld.%06lds)",
-					icarus->drv->name, icarus->device_id,
-					(long unsigned int)estimate_hashes,
-					elapsed.tv_sec, elapsed.tv_usec);
-		}
+		applog(LOG_DEBUG, "%s%d: no nonce = 0x%08lX hashes (%ld.%06lds)",
+				icarus->drv->name, icarus->device_id,
+				(long unsigned int)estimate_hashes,
+				elapsed.tv_sec, elapsed.tv_usec);
 
 		return estimate_hashes;
 	}
@@ -1056,12 +1084,10 @@ static int64_t icarus_scanhash(struct thr_info *thr, struct work *work,
 	if (opt_debug || info->do_icarus_timing)
 		timersub(&tv_finish, &tv_start, &elapsed);
 
-	if (opt_debug) {
-		applog(LOG_DEBUG, "%s%d: nonce = 0x%08x = 0x%08lX hashes (%ld.%06lds)",
-				icarus->drv->name, icarus->device_id,
-				nonce, (long unsigned int)hash_count,
-				elapsed.tv_sec, elapsed.tv_usec);
-	}
+	applog(LOG_DEBUG, "%s%d: nonce = 0x%08x = 0x%08lX hashes (%ld.%06lds)",
+			icarus->drv->name, icarus->device_id,
+			nonce, (long unsigned int)hash_count,
+			elapsed.tv_sec, elapsed.tv_usec);
 
 	// Ignore possible end condition values ... and hw errors
 	// TODO: set limitations on calculated values depending on the device