[mythtv] DVB CAM hickups

[Jesper Sörensen]

I'm having some problems with my DVB card (Hauppauge Nova-CI-S with a 
Conax CAM):
- I'm getting quite a lot of CAM errors & resets in the log (frequency 
varies, but sometimes about once/minute)
- Mythbackend sometimes crashes without any further info (probably 
related to the CAM errors)

I'm trying to pin down the problem but with full logging I get an 
enormous amount of the messages below (like 30-40 loops per second):

mythbackend.log:
--> 00 01 A0 01 01
<-- 00 01 80 02 01 00
    .  .  .  .  .  .
--> 00 01 A0 01 01
<-- 00 01 80 02 01 00
    .  .  .  .  .  .
--> 00 01 A0 01 01
<-- 00 01 80 02 01 00
    .  .  .  .  .  .
--> 00 01 A0 01 01
<-- 00 01 80 02 01 00
    .  .  .  .  .  .
--> 00 01 A0 01 01
<-- 00 01 80 02 01 00
    .  .  .  .  .  .

syslog:
May  2 15:45:39 htpc kernel: FR/DA IRQ slot:0
May  2 15:45:39 htpc kernel: dvb_ca_en50221_thread_wakeup
May  2 15:45:39 htpc kernel: dvb_ca_en50221_read_data
May  2 15:45:39 htpc kernel: dvb_ca_en50221_read_data
May  2 15:45:39 htpc kernel: dvb_ca_en50221_io_poll
May  2 15:45:39 htpc kernel: dvb_ca_en50221_io_read
May  2 15:45:39 htpc kernel: dvb_ca_en50221_io_write
May  2 15:45:39 htpc kernel: dvb_ca_en50221_write_data
May  2 15:45:39 htpc kernel: dvb_ca_en50221_io_poll

Is this normal, or is this maybe the cause of the problem (the CAM 
getting overloaded with all this traffic)?