diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 5c047227..3c4d8afd 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -700,6 +700,8 @@ Oliver Endriss <o.endriss@gmx.de>
  for helping to debug a problem with reduced number of retries in Transfer Mode on
  SD-FF cards
  for reporting a problem with resuming replay of PES recordings
+ for suggesting to make all bonded devices (except for the master) turn off their LNB
+ power completely to avoid problems when receiving vertically polarized transponders
 
 Reinhard Walter Buchner <rw.buchner@freenet.de>
  for adding some satellites to 'sources.conf'
@@ -3161,3 +3163,7 @@ Dominique Dumont <domi.dumont@free.fr>
 
 Seppo Ingalsuo <seppo.ingalsuo@iki.fi>
  for a patch that was used as a base for implementing support for positioners
+
+Manfred Völkel <mvoelkel@digitaldevices.de>
+ for suggesting to make all bonded devices (except for the master) turn off their LNB
+ power completely to avoid problems when receiving vertically polarized transponders
diff --git a/HISTORY b/HISTORY
index 9751372c..175eb2de 100644
--- a/HISTORY
+++ b/HISTORY
@@ -7813,7 +7813,7 @@ Video Disk Recorder Revision History
 - Fixed a crash in the LCARS skin's main menu in case there is no current channel
   (reported by Dominique Dumont).
 
-2013-08-22: Version 2.1.1
+2013-08-23: Version 2.1.1
 
 - Fixed initializing cDevice::keepTracks.
 - Fixed an endless loop in cTextWrapper::Set() in case the given Width is smaller than
@@ -7879,3 +7879,6 @@ Video Disk Recorder Revision History
   systems that are only used as a receiver and don't actually display anything.
 - Increased the value of MAXRETRIES to 20 to reduce the probability of disturbances
   in transfer mode.
+- All bonded devices (except for the master) now turn off their LNB power completely
+  to avoid problems when receiving vertically polarized transponders (suggested by
+  Manfred Völkel and Oliver Endriss).
diff --git a/dvbdevice.c b/dvbdevice.c
index 9504834d..c61fb172 100644
--- a/dvbdevice.c
+++ b/dvbdevice.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: dvbdevice.c 3.2 2013/08/17 13:52:05 kls Exp $
+ * $Id: dvbdevice.c 3.3 2013/08/23 09:19:43 kls Exp $
  */
 
 #include "dvbdevice.h"
@@ -739,7 +739,7 @@ void cDvbTuner::ExecuteDiseqc(const cDiseqc *Diseqc, unsigned int *Frequency)
 
 void cDvbTuner::ResetToneAndVoltage(void)
 {
-  CHECK(ioctl(fd_frontend, FE_SET_VOLTAGE, SEC_VOLTAGE_13));
+  CHECK(ioctl(fd_frontend, FE_SET_VOLTAGE, bondedTuner ? SEC_VOLTAGE_OFF : SEC_VOLTAGE_13));
   CHECK(ioctl(fd_frontend, FE_SET_TONE, SEC_TONE_OFF));
 }