[linux-dvb] Re: Problem with alps_tdlb7 using current dvb-kernel

[Juri Haberland <juri@koschikode.com>]

Torbjörn Jansson wrote:

>> So I went the hard the way, using current dvb-kernel, running
>> makelinks, recompiled the kernel and also installed the cvs snapshot
>> of video4linux. After that I could load the all the need stuff for the
>> Avermedia 711 and
>> it worked using 'tzap -r' and 'cat /dev/dvb/adapter0/dvr0 > somefile',
>> but my FF-DVB-T card using the alps_tdlb7 stopped working.
>> Actually, all
>> modules loaded fine, firmware loaded, too, but tuning didn't work
>> anymore. (also 'tzap -r' and 'cat /dev/dvb...' didn't work)

> My guess is that this coud be caused by the major device number change on
> the dvb entries in /dev/dvb

I doubt that, as I'm using devfs, which should take care of that,
shouldn't it?

> If you load the modules and run:
> cat /proc/devices
> 
> What is the number before DVB?
> Is it the same as the first number when you do:
> ls -l /dev/dvb/adapter0

Yes, both use 212.

I think that the transition from dvb-i2c to kernel-i2c is the real culprit.

Tuning with the tdlb7 looks now like this:
# /usr/src/DVB/apps/szap/tzap -a0 -r K44
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 658000000 Hz
video pid 0x0181, audio pid 0x0182
status 00 | signal 0000 | snr b7fd | ber 00000000 | unc 00000000 |
status 16 | signal 0000 | snr b7fd | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 00 | signal 0000 | snr b7fd | ber 00000000 | unc 00000000 |
status 16 | signal 0000 | snr b7fd | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 00 | signal 0000 | snr b7fd | ber 00000000 | unc 00000000 |

Whereas with the Avermedia it works as expected:
# /usr/src/DVB/apps/szap/tzap -a2 -r K44
using '/dev/dvb/adapter2/frontend0' and '/dev/dvb/adapter2/demux0'
tuning to 658000000 Hz
video pid 0x0181, audio pid 0x0182
status 00 | signal ffff | snr 0000 | ber 00000000 | unc 00000000 |
status 1f | signal ffff | snr bebe | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal ffff | snr bdbd | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal ffff | snr bbbb | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal ffff | snr bdbd | ber 00000000 | unc 00000000 |
FE_HAS_LOCK

(in case someone wonders: adapter1 is a FF-DVB-C).

Cheers,
Juri