[linux-dvb] QAM_64 and QAM_128 blues

[JosceJ@netscape.net]

My card: Hauppage DVB-C
DVB driver: dvb-20021025.tar.bz
VDR: 1.1.13

I have a problem with DVB driver that I can't
figure out. If I set:

static struct dvb_frontend_parameters default_param [] =
...
{    {                       /* Cable */
        frequency: 282750000,
        inversion: INVERSION_OFF,
        { qam:  { symbol_rate: 5900000,
              fec_inner: FEC_AUTO,
              modulation: QAM_128
            }
        }
    },
...

I have no problem using all channels that
have QAM_128 and symbol_rate: 5900000, but
I can't tune into QAM_64 symbol_rate: 6900000

If I set default_param [] for cable to
QAM_64 and symbol_rate: 6900000 I can tune
into all QAM_64 channels but not to QAM_128.

What happens is that when I start with a QAM_128 channel
and get a lock all is well. If I then try to switch to
a QAM_64 channel the zigzag starts and never
stops and when I try to change channels in VDR
back to a QAM_128 the DVB driver doesn't seem to respond,
it just keeps zigzagging on the old QAM_128 channel.

This would be a typical scenario:

Start up DVB with QAM_128, sRate 5900000 -> OK
Start VDR with Channel 1 QAM_128, sRate 5900000 -> OK
Switch VDR Channel 2 QAM_128, sRate 5900000 -> OK
Switch VDR Channel 3 QAM_64, sRate 6900000 -> ZIGZAG never stops
Switch VDR Channel 1 QAM_128, sRate 5900000 -> NO REPLY

Any ideas?

Josce



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