On Wed, Sep 23, 2009 at 10:55 AM, VDR User <user.vdr@xxxxxxxxx> wrote:
> Over a month ago I reported a problem with a change that was made to
> the Genpix driver which broke 8PSK. The change limited DVB-S streams
> to QPSK and 8PSK to DVB-S2. There are a couple problems with this.
> First of all, Genpix devices do NOT support DVB-S2 but pretends to for
> access to 8PSK. Secondly, the 8PSK the Genpix provides is modified,
> aka 8PSK turbo-fec. Two of the biggest North American DVB-S providers
> use 8PSK turbo-fec for a lot of their content. Therefore, limiting
> DVB-S to QPSK only is crippling reception of all those providers
> transponders which use it.
>
> Ideally 8PSK should be allowed for DVB-S in v4l so that a device like
> the Genpix doesn't have to pretend to be something it's not to use it.
> While I seriously doubt that will be fixed, this problem can still be
> resolved by simply reverting back to the drivers original behavior
> with the following patch:
>
> diff -pruN v4l-dvb.orig/linux/drivers/media/dvb/dvb-usb/gp8psk-fe.c
> v4l-dvb/linux/drivers/media/dvb/dvb-usb/gp8psk-fe.c
> --- v4l-dvb.orig/linux/drivers/media/dvb/dvb-usb/gp8psk-fe.c
> 2009-08-14 19:17:43.000000000 -0700
> +++ v4l-dvb/linux/drivers/media/dvb/dvb-usb/gp8psk-fe.c 2009-08-14
> 19:19:18.000000000 -0700
> @@ -146,8 +146,8 @@ static int gp8psk_fe_set_frontend(struct
>
> switch (c->delivery_system) {
> case SYS_DVBS:
> - /* Only QPSK is supported for DVB-S */
> - if (c->modulation != QPSK) {
> + /* Allow QPSK and 8PSK */
> + if (c->modulation != QPSK && c->modulation != PSK_8) {
> deb_fe("%s: unsupported modulation selected (%d)\n",
> __func__, c->modulation);
> return -EOPNOTSUPP;
>
Now another month has passed and this problem still has not been
fixed. Please do so!
Best regards,
Derek
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