diff --git a/configure.ac b/configure.ac
index a342190c456..e9a929e4f2f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -465,6 +465,10 @@ if test x"$with_amlogic" = xyes ; then
 	ALSA_CFLAGS="-lasound"
 fi
 
+if test "$BOXTYPE" == "dm7080" -o "$BOXTYPE" == "dm820" -o "$BOXTYPE" == "dm800se" -o "$BOXTYPE" == "dm800sev2" -o "$BOXTYPE" == "dm7020hd" -o "$BOXTYPE" == "dm7020hdv2" -o "$BOXTYPE" == "dm900" -o "$BOXTYPE" == "dm920"; then
+	AC_DEFINE(DREAMBOX_DUAL_TUNER, 1,[define BOXTYPE DM7080])
+fi
+
 if test "$BOXTYPE" == "dm7080" -o "$BOXTYPE" == "dm820"  -o "$BOXTYPE" == "dm900" -o "$BOXTYPE" == "dm920" -o "$BOXTYPE" == "dm520"; then
 	AC_DEFINE(CONFIG_ION, 1,[define BOX use ION Allocator])
 fi
diff --git a/lib/dvb_ci/dvbci.cpp b/lib/dvb_ci/dvbci.cpp
index 231ec494a4d..ffef6815a9e 100644
--- a/lib/dvb_ci/dvbci.cpp
+++ b/lib/dvb_ci/dvbci.cpp
@@ -40,6 +40,67 @@
 
 eDVBCIInterfaces *eDVBCIInterfaces::instance = 0;
 
+static char* readInputCI(int NimNumber)
+{
+	char id1[] = "NIM Socket";
+	char id2[] = "Input_Name";
+	char keys1[] = "1234567890";
+	char keys2[] = "12ABCDabcd";
+	char *inputName = 0;
+	char buf[256];
+	FILE *f;
+
+	f = fopen("/proc/bus/nim_sockets", "rt");
+	if (f)
+	{
+		while (fgets(buf, sizeof(buf), f))
+		{
+			char *p = strcasestr(buf, id1);
+			if (!p)
+				continue;
+
+			p += strlen(id1);
+			p += strcspn(p, keys1);
+			if (*p && strtol(p, 0, 0) == NimNumber)
+				break;
+		}
+
+		while (fgets(buf, sizeof(buf), f))
+		{
+			if (strcasestr(buf, id1))
+				break;
+
+			char *p = strcasestr(buf, id2);
+			if (!p)
+				continue;
+
+			p = strchr(p + strlen(id2), ':');
+			if (!p)
+				continue;
+
+			p++;
+			p += strcspn(p, keys2);
+			size_t len = strspn(p, keys2);
+			if (len > 0)
+			{
+				inputName = strndup(p, len);
+				break;
+			}
+		}
+
+		fclose(f);
+	}
+
+	return inputName;
+}
+
+static std::string getTunerLetterDM(int NimNumber)
+{
+	char *srcCI = readInputCI(NimNumber);
+	if (srcCI) return std::string(srcCI);
+	return eDVBCISlot::getTunerLetter(NimNumber);
+}
+
 #ifdef __sh__
 bool eDVBCISlot::checkQueueSize()
 {
@@ -296,7 +357,11 @@ eDVBCIInterfaces::eDVBCIInterfaces()
 	}
 
 	for (eSmartPtrList<eDVBCISlot>::iterator it(m_slots.begin()); it != m_slots.end(); ++it)
+#ifdef DREAMBOX_DUAL_TUNER
+		it->setSource(getTunerLetterDM(0));
+#else
 		it->setSource("A");
+#endif
 
 	for (int tuner_no = 0; tuner_no < 26; ++tuner_no) // NOTE: this assumes tuners are A .. Z max.
 	{
@@ -307,7 +372,11 @@ eDVBCIInterfaces::eDVBCIInterfaces()
 		if(::access(path.str().c_str(), R_OK) < 0)
 			break;
 
+#ifdef DREAMBOX_DUAL_TUNER
+		setInputSource(tuner_no, getTunerLetterDM(tuner_no));
+#else
 		setInputSource(tuner_no, eDVBCISlot::getTunerLetter(tuner_no));
+#endif
 	}
 
 	eDebug("[CI] done, found %d common interface slots", num_ci);
@@ -724,7 +793,11 @@ void eDVBCIInterfaces::recheckPMTHandlers()
 							if (tunernum != -1)
 							{
 								setInputSource(tunernum, ci_source.str());
+#ifdef DREAMBOX_DUAL_TUNER
+								ci_it->setSource(getTunerLetterDM(tunernum));
+#else
 								ci_it->setSource(eDVBCISlot::getTunerLetter(tunernum));
+#endif
 							}
 							else
 							{
@@ -820,7 +893,11 @@ void eDVBCIInterfaces::removePMTHandler(eDVBServicePMTHandler *pmthandler)
 				slot->sendCAPMT(pmthandler, caids);  // send a capmt without caids to remove a running service
 				slot->removeService(service_to_remove.getServiceID().get());
 				/* restore ci source to the default (tuner "A") */
+#ifdef DREAMBOX_DUAL_TUNER
+				slot->setSource(getTunerLetterDM(0));
+#else
 				slot->setSource("A");
+#endif
 			}
 
 			if (!--slot->use_count)
@@ -881,61 +958,6 @@ int eDVBCIInterfaces::getMMIState(int slotid)
 	return slot->getMMIState();
 }
 
-static char* readInputCI(int NimNumber)
-{
-	char id1[] = "NIM Socket";
-	char id2[] = "Input_Name";
-	char keys1[] = "1234567890";
-	char keys2[] = "12ABCDabcd";
-	char *inputName = 0;
-	char buf[256];
-	FILE *f;
-
-	f = fopen("/proc/bus/nim_sockets", "rt");
-	if (f)
-	{
-		while (fgets(buf, sizeof(buf), f))
-		{
-			char *p = strcasestr(buf, id1);
-			if (!p)
-				continue;
-
-			p += strlen(id1);
-			p += strcspn(p, keys1);
-			if (*p && strtol(p, 0, 0) == NimNumber)
-				break;
-		}
-
-		while (fgets(buf, sizeof(buf), f))
-		{
-			if (strcasestr(buf, id1))
-				break;
-
-			char *p = strcasestr(buf, id2);
-			if (!p)
-				continue;
-
-			p = strchr(p + strlen(id2), ':');
-			if (!p)
-				continue;
-
-			p++;
-			p += strcspn(p, keys2);
-			size_t len = strspn(p, keys2);
-			if (len > 0)
-			{
-				inputName = strndup(p, len);
-				break;
-			}
-		}
-
-		fclose(f);
-	}
-
-	return inputName;
-}
-
-
 int eDVBCIInterfaces::setInputSource(int tuner_no, const std::string &source)
 {
 	if (tuner_no >= 0)
@@ -1706,7 +1728,7 @@ int eDVBCISlot::setSource(const std::string &source)
 	snprintf(buf, sizeof(buf), "/proc/stb/tsmux/ci%d_input", slotid);
 	char *srcCI = NULL;
 
-	if(source.find("CI") == std::string::npos)
+	if(source.find("CI") == std::string::npos || source.size() == 1)
 	{
 		srcCI = readInputCI(source[0]-65);
 	}