diff --git a/HISTORY b/HISTORY
index 68c2c6ae..37136f79 100644
--- a/HISTORY
+++ b/HISTORY
@@ -7612,3 +7612,6 @@ Video Disk Recorder Revision History
 - Updated the Lithuanian OSD texts (thanks to Valdemaras Pipiras).
 - The timeout for trying to switch to a valid programme is now reset immediately once
   a programme has been found.
+- No longer checking for EOPNOTSUPP in cDvbTuner::GetSignalQuality() to avoid breaking
+  this function in case the driver suddenly decides to return a different errno value
+  if an operation is not supported.
diff --git a/dvbdevice.c b/dvbdevice.c
index 27482e8b..af374c5d 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 2.77 2012/12/30 13:08:41 kls Exp $
+ * $Id: dvbdevice.c 2.78 2013/02/14 13:21:34 kls Exp $
  */
 
 #include "dvbdevice.h"
@@ -583,15 +583,13 @@ int cDvbTuner::GetSignalQuality(void) const
      while (1) {
            if (ioctl(fd_frontend, FE_READ_SNR, &Snr) != -1)
               break;
-           if (errno == EOPNOTSUPP) {
+           if (errno != EINTR) {
               Snr = 0xFFFF;
 #ifdef DEBUG_SIGNALQUALITY
               HasSnr = false;
 #endif
               break;
               }
-           if (errno != EINTR)
-              return -1;
            }
 #ifdef DEBUG_SIGNALQUALITY
      bool HasBer = true;
@@ -600,15 +598,13 @@ int cDvbTuner::GetSignalQuality(void) const
      while (1) {
            if (ioctl(fd_frontend, FE_READ_BER, &Ber) != -1)
               break;
-           if (errno == EOPNOTSUPP) {
+           if (errno != EINTR) {
               Ber = 0;
 #ifdef DEBUG_SIGNALQUALITY
               HasBer = false;
 #endif
               break;
               }
-           if (errno != EINTR)
-              return -1;
            }
 #ifdef DEBUG_SIGNALQUALITY
      bool HasUnc = true;
@@ -617,15 +613,13 @@ int cDvbTuner::GetSignalQuality(void) const
      while (1) {
            if (ioctl(fd_frontend, FE_READ_UNCORRECTED_BLOCKS, &Unc) != -1)
               break;
-           if (errno == EOPNOTSUPP) {
+           if (errno != EINTR) {
               Unc = 0;
 #ifdef DEBUG_SIGNALQUALITY
               HasUnc = false;
 #endif
               break;
               }
-           if (errno != EINTR)
-              return -1;
            }
      uint16_t MaxSnr = 0xFFFF; // Let's assume the default is using the entire range.
      // Use the subsystemId to identify individual devices in case they need