Bug 41232

Summary: Channel switching on Hauppauge Nova-T stick fails randomly
Product: v4l-dvb Reporter: q222
Component: dvb-usbAssignee: dvb-usb (v4l-dvb_dvb-usb)
Status: CLOSED DUPLICATE    
Severity: normal CC: florian, leho, maciej.rutecki, rjw
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 3.0 Subsystem:
Regression: Yes Bisected commit-id:
Bug Depends on:    
Bug Blocks: 36912    

Description q222 2011-08-16 11:33:36 UTC 
Switching channels in kaffine on my DVB-T stick worked fine up to 2.6.39. Since upgrading to 3.0, if fails about half the time with no discernable pattern.

/var/log/warn is littered with messages like these:
Aug 14 16:46:56 coral kernel: [278131.974707] DiB0070 I2C write failed
Aug 14 16:47:06 coral kernel: [278142.272778] dib0700: tx buffer length is larger than 4. Not supported.
Aug 14 16:47:06 coral kernel: [278142.276734] DiB0070 I2C write failed
Aug 14 16:48:52 coral kernel: [278248.743036] DiB0070 I2C write failed
Aug 14 16:49:38 coral kernel: [278294.082043] DiB0070 I2C write failed
Aug 14 16:49:42 coral kernel: [278298.805911] dib0700: tx buffer length is larger than 4. Not supported.

The device in question uses the dvb-usb-dib0700-1.20.fw firmware file.

lsusb output:
Bus 002 Device 002: ID 2040:7070 Hauppauge Nova-T Stick 3
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x2040 Hauppauge
  idProduct          0x7070 Nova-T Stick 3
  bcdDevice            1.00
  iManufacturer           1 Hauppauge
  iProduct                2 Nova-T Stick
  iSerial                 3 4032310248
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           46
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           4
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval              10
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               1
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0000
  (Bus Powered)
Comment 1 Leho Kraav 2011-08-19 14:33:45 UTC 
seeing the same with 3.0.2
Comment 2 Leho Kraav 2011-08-19 15:21:42 UTC 
these patches seemed to have improved my TerraTec T3 into working condition again:

http://www.spinics.net/lists/linux-media/msg36186.html

https://github.com/OpenELEC/OpenELEC.tv/blob/4c1fc081335e0ae6d7107debb0336da05200b9a4/packages/linux/patches/linux-3.0.1-060-fix_dib0700_buffer_access-0.1.patch

patch applied cleanly on top of 3.0.2.
Comment 3 q222 2011-08-19 23:47:39 UTC 
(In reply to comment #2)
> these patches seemed to have improved my TerraTec T3 into working condition
> again:
> 
> http://www.spinics.net/lists/linux-media/msg36186.html
> 
>
> https://github.com/OpenELEC/OpenELEC.tv/blob/4c1fc081335e0ae6d7107debb0336da05200b9a4/packages/linux/patches/linux-3.0.1-060-fix_dib0700_buffer_access-0.1.patch
> 
> patch applied cleanly on top of 3.0.2.

This patch applied to 3.0.3 seems to indeed fix the problem. I hope this gets integrated into the stable kernel rather quickly.
Comment 4 Leho Kraav 2011-08-21 22:28:16 UTC 
i am noticing my tv channel picture just hangs at an unspecified point in time (tvheadend 2.12 -> xbmc pvr). it's usually measured in 1+ hours. stop, play cycle brings it back to life.
Comment 6 Rafael J. Wysocki 2011-08-29 20:32:44 UTC 

*** This bug has been marked as a duplicate of bug 41262 ***