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[psalter <phil_salter@xxxxxxxxx>]

Thanks to the details above I was able to get my Dvico Fusion Dual Digital 4 working on Mythbuntu Trusty 14.04.3  . The problem was solved at kernel 3.19. Problem is related to cxusb.c where the #define MAX_XFER_SIZE 80 was changed from 64 to 80. Details of change are at LinuxTV.org:
https://git.linuxtv.org/media_tree.git/commit/?id=eb9da073bd002f2968c84129a5c49625911a3199


diff --git a/drivers/media/usb/dvb-usb/cxusb.c b/drivers/media/usb/dvb-usb/cxusb.c
index b7461ac..f379f7e 100644
--- a/drivers/media/usb/dvb-usb/cxusb.c
+++ b/drivers/media/usb/dvb-usb/cxusb.c
@@ -46,7 +46,7 @@
 #include "si2157.h"
 
 /* Max transfer size done by I2C transfer functions */
-#define MAX_XFER_SIZE  64
+#define MAX_XFER_SIZE  80
 
 /* debug */
 static int dvb_usb_cxusb_debug;

I looked through the ubuntu kernels for the updated cxusb.c and found it looked ok after 3.19.0   .
To fix my Mythbuntu Trusty I loaded linux-headers-3.19.0-47  and it all worked.

I wanted to update comments here so that anyone else doing searches for
the problem might find a quick answer as there are not very many search
results relating to Dvico card and later kernel.

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https://bugs.launchpad.net/bugs/1291459

Title:
  ioctl FE_GET_INFO hangs with DViCO FusionHDTV DVB-T Dual Digital 4
  card

Status in linux package in Ubuntu:
  Confirmed
Status in linux-firmware package in Ubuntu:
  Confirmed

Bug description:
  Top level symptom:
  mythtv-backend fails to listen for client connections.
  It stops at: (strace mythbackend)
  open("/dev/dvb/adapter1/frontend0", O_RDWR|O_NONBLOCK) = 16
  ioctl(16, FE_GET_INFO

  me-tv also hangs in a similar manner.

  I expected the ioctl call to succeed, and for the top level
  applications to function properly. Instead, they hang.

  The machine has 3 dvb tuners as follows:
  **************** Adapter 0
  Mar 12 22:32:53 mythtv kernel: [   17.428195] input: Budget-CI dvb ir receiver saa7146 (0) as /devices/pci0000:00/0000:00:1e.0/0000:05
  :00.0/rc/rc0/input13
  Mar 12 22:32:53 mythtv kernel: [   17.428251] rc0: Budget-CI dvb ir receiver saa7146 (0) as /devices/pci0000:00/0000:00:1e.0/0000:05:0
  0.0/rc/rc0
  Mar 12 22:32:53 mythtv kernel: [   17.432801] budget_ci dvb 0000:05:00.0: DVB: registering adapter 0 frontend 0 (Philips TDA10045H DVB
  -T)...
  **************** Adapter 1
  Mar 12 22:32:53 mythtv kernel: [   17.646727] DVB: registering new adapter (DViCO FusionHDTV DVB-T Dual Digital 4)
  Mar 12 22:32:53 mythtv kernel: [   17.797366] usb 3-1: DVB: registering adapter 1 frontend 0 (Zarlink ZL10353 DVB-T)...
  **************** Adapter 2
  Mar 12 22:32:53 mythtv kernel: [   17.831769] DVB: registering new adapter (DViCO FusionHDTV DVB-T Dual Digital 4)
  Mar 12 22:32:53 mythtv kernel: [   17.882250] cxusb: No IR receiver detected on this device.
  Mar 12 22:32:53 mythtv kernel: [   17.882258] usb 3-2: DVB: registering adapter 2 frontend 0 (Zarlink ZL10353 DVB-T)...

  There appears to be a problem loading the firmware for the xc2028 in
  the DViCO FusionHDTV card:

  Mar 13 02:07:59 mythtv kernel: [   37.348226] xc2028 10-0061: Loading firmware for type=BASE F8MHZ (3), id 0000000000000000.
  Mar 13 02:07:59 mythtv kernel: [   37.360226] cxusb: i2c wr: len=64 is too big!
  Mar 13 02:07:59 mythtv kernel: [   37.360226] 
  Mar 13 02:07:59 mythtv kernel: [   37.360230] xc2028 10-0061: i2c output error: rc = -95 (should be 64)
  Mar 13 02:07:59 mythtv kernel: [   37.360231] xc2028 10-0061: -95 returned from send
  Mar 13 02:07:59 mythtv kernel: [   37.360234] xc2028 10-0061: Error -22 while loading base firmware
  Mar 13 02:07:59 mythtv kernel: [   37.412233] xc2028 11-0061: Loading firmware for type=BASE F8MHZ (3), id 0000000000000000.
  Mar 13 02:07:59 mythtv kernel: [   37.424360] cxusb: i2c wr: len=64 is too big!
  Mar 13 02:07:59 mythtv kernel: [   37.424360] 
  Mar 13 02:07:59 mythtv kernel: [   37.424364] xc2028 11-0061: i2c output error: rc = -95 (should be 64)
  Mar 13 02:07:59 mythtv kernel: [   37.424365] xc2028 11-0061: -95 returned from send
  Mar 13 02:07:59 mythtv kernel: [   37.424368] xc2028 11-0061: Error -22 while loading base firmware
  Mar 13 02:07:59 mythtv kernel: [   37.428486] xc2028 10-0061: Loading firmware for type=BASE F8MHZ (3), id 0000000000000000.
  Mar 13 02:07:59 mythtv kernel: [   37.492247] xc2028 11-0061: Loading firmware for type=BASE F8MHZ (3), id 0000000000000000.

  The firmware is loaded from the file xc3028-v27.fw:
  Mar 13 02:07:42 mythtv kernel: [   18.108746] xc2028 11-0061: creating new instance
  Mar 13 02:07:42 mythtv kernel: [   18.108748] xc2028 11-0061: type set to XCeive xc2028/xc3028 tuner
  Mar 13 02:07:42 mythtv kernel: [   18.108801] xc2028 11-0061: Loading 80 firmware images from xc3028-v27.fw, type: xc2028 firmware, ver 2.7
  Mar 13 02:07:42 mythtv kernel: [   18.109670] dvb-usb: DViCO FusionHDTV DVB-T Dual Digital 4 successfully initialized and connected.

  The firmware file /lib/firmware/xc3028-v27.fw belongs to the linux-firmware-nonfree 1.14.ubuntu1 package. I have located instructions on the origin of this file (http://www.linuxtv.org/wiki/index.php/Xceive_XC3028/XC2028#How_to_Obtain_the_Firmware)
  and I have verified that the firmware file is identical to the one obtained by that method.

  The DViCO FusionHDTV card has been used for several years in this
  machine. This problem only occurred after upgrading to saucy
  salamander.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-18-generic 3.11.0-18.32
  ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
  Uname: Linux 3.11.0-18-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  loungeroom   2246 F.... pulseaudio
   /dev/snd/controlC0:  loungeroom   2246 F.... pulseaudio
  Date: Thu Mar 13 02:28:43 2014
  HibernationDevice: RESUME=UUID=335a7d97-3ccb-47e1-a25a-78717e9f04a7
  IwConfig:
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. EP43-DS3L
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-18-generic root=/dev/mapper/Ubuntu-precise_root ro radeon.audio=1 crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-18-generic N/A
   linux-backports-modules-3.11.0-18-generic  N/A
   linux-firmware                             1.116.2
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2014-02-20 (20 days ago)
  WifiSyslog:
   
  dmi.bios.date: 09/22/2008
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F8
  dmi.board.name: EP43-DS3L
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF8:bd09/22/2008:svnGigabyteTechnologyCo.,Ltd.:pnEP43-DS3L:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnEP43-DS3L:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: EP43-DS3L
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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