ok, some additional informations:
> It seems, there I have some timing problems with ivtv driver. My box: Abit
It is definitely timing problem. By inspection of logs I found info about
'ivtv0 info: Sleeping for 150ms (600 recommended)'
And my kernels are compiled with HZ=250 (recommended value). So I recompiled 
them, and suddenly with
'ivtv0 info: Sleeping for 600ms (600 recommended)'
ivtv-0.6.3 works always, ivtv-0.7.0 can be reliably initialized, but the 
second attempt to load ivtv-0.7.0 results in the frozen box.
I reached same results by hardwiring of 600ms into ivtv-driver.h, thus
---#define IVTV_SDRAM_SLEEPTIME (60 * HZ / 100)   /* 600ms */
++#define IVTV_SDRAM_SLEEPTIME 600  /* 600ms */
for kernels with HZ=250.
The trouble is, I cannot safely use kernels compiled with HZ=100 (my uhci_hdc 
iface does not like it..), so I have to deal with the 'bruto-force' 
redefinition of IVTV_SDRAM_SLEEPTIME. But this is not the situation I would 
like, for sure....
-- 
Jan Taimr
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The worst computer virus is an end-user
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