Terratec S7 USB: Scanning doesn't reliably work on Astra 19.2E

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Hello,

I'm trying to get a Terratec S7 to work. The driver, just cloned v4l-dvb, compiles and loads fine but when I try to scan Astra 19.2E only a few stations get scanned. In most cases I get a tuning error. Under Win7 the box works perfectly, so it's not a hardware defect or antenna specific issue.
Any help would be very appreciated.

Information about my system:
- Core i5 661 running on Gigabyte board

# uname -a
Linux mmedia 2.6.33-020633-generic #020633 SMP Thu Feb 25 10:10:03 UTC 2010 x86_64 GNU/Linux

# lsusb -v -s 002:004

Bus 002 Device 004: ID 0ccd:10ac TerraTec Electronic GmbH
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x0ccd TerraTec Electronic GmbH
  idProduct          0x10ac
  bcdDevice            0.03
  iManufacturer           1
  iProduct                2
  iSerial                 3
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xc0
      Self Powered
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval             100
      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
can't get device qualifier: Operation not permitted
can't get debug descriptor: Operation not permitted
cannot read device status, Operation not permitted (1)

# lsmod
lsmod
Module                  Size  Used by
dvb_usb_az6027         16534  1
stb6100                 6772  1 dvb_usb_az6027
stb0899                34318  1 dvb_usb_az6027
dvb_usb                19392  1 dvb_usb_az6027
dvb_core              101054  2 dvb_usb_az6027,dvb_usb
binfmt_misc             7901  1
ppdev                   6503  0
bridge                 50766  0
stp                     2059  1 bridge
bnep                   11733  2
snd_hda_codec_intelhdmi    18424  1
snd_hda_codec_realtek   285848  1
snd_hda_intel          27340  1
snd_hda_codec 87794 3 snd_hda_codec_intelhdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep               6686  1 snd_hda_codec
snd_pcm_oss            42660  0
snd_mixer_oss          17285  1 snd_pcm_oss
snd_pcm                87952  3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_seq_dummy           1836  0
snd_seq_oss            30234  0
snd_seq_midi            5722  0
snd_rawmidi            22532  1 snd_seq_midi
snd_seq_midi_event      6867  2 snd_seq_oss,snd_seq_midi
snd_seq 55304 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer              23536  2 snd_pcm,snd_seq
snd_seq_device 6520 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
k8temp                  4056  0
iptable_filter          2743  0
snd 69404 15 snd_hda_codec_intelhdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
it87                   24835  0
soundcore               7945  1 snd
ip_tables              18228  1 iptable_filter
snd_page_alloc          8476  2 snd_hda_intel,snd_pcm
x_tables               21305  1 ip_tables
hwmon_vid               3083  1 it87
lp                     10024  0
btusb                  12784  2
serio_raw               4893  0
parport                38004  2 ppdev,lp
xfs                   927033  10
exportfs                4243  1 xfs
fbcon                  39731  72
tileblit                2311  1 fbcon
font                    8005  1 fbcon
bitblit                 5213  1 fbcon
softcursor              1485  1 bitblit
i915                  315226  2
drm_kms_helper         30180  1 i915
pata_it8213             3970  0
r8169                  41344  0
mii                     4933  1 r8169
drm                   195147  3 i915,drm_kms_helper
i2c_algo_bit            5830  1 i915
video                  22073  1 i915
intel_agp              28717  1
output                  2391  1 video

# dmesg

[ 514.230862] usb 2-5: new high speed USB device using ehci_hcd and address 4 [ 514.636137] dvb-usb: found a 'TERRATEC S7 MKII' in cold state, will try to load a firmware
[  514.636142] usb 2-5: firmware: requesting dvb-usb-az6027-03.fw
[ 514.671231] dvb-usb: downloading firmware from file 'dvb-usb-az6027-03.fw'
[  514.745683] dvb-usb: found a 'TERRATEC S7 MKII' in warm state.
[ 514.745740] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[  514.963579] DVB: registering new adapter (TERRATEC S7 MKII)
[  516.942119] stb0899_attach: Attaching STB0899
[  516.942126] stb6100_attach: Attaching STB6100
[ 516.942606] DVB: registering adapter 0 frontend 0 (STB0899 Multistandard)... [ 516.942737] input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1d.7/usb2/2-5/input/input4
[  516.942788] dvb-usb: schedule remote query interval to 400 msecs.
[ 516.942794] dvb-usb: TERRATEC S7 MKII successfully initialized and connected.
[  516.942844] usbcore: registered new interface driver dvb_usb_az6027

Here some output from w_scan during scan. With scan-s2 it's the same, I always get "tuning failed".

Thank you for any assistance in advance and best regards,

    Jens

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