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I have two tv-cards for watching digital programs in Hong Kong. One is a atbm8830 (usb), another is lgs8gl5 (pci-e). They both worked ok before the kernel 3.3. After upgraded to kernel 3.3, both of them stop working anymore. By peeking into the codes, i found the core frontend (and the xc5000) will not accept a delivery system of SYS_DMBTH.  In my last post, as I said, it is only a small amount of people care about this xxxx. Although I joined the mailing list of dvb-media group and asked them to add the support for the dmb-th system. There is no reply. so i am writing it down here in case i will forget what i did.

in the core frontend.c

 drivers/media/dvb/dvb-core/dvb_frontend.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index aebcdf2..ee1cc10 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -1531,6 +1531,13 @@ static int set_delivery_system(struct dvb_frontend *fe, u32 desired_system)
                                delsys = desired_system;
                                break;
                        }
+
+                       /* check if the fe delivery system corresponds
+                          to the delivery system in cache */
+                       if (fe->ops.delsys[ncaps] == c->delivery_system) {
+                               delsys = c->delivery_system;
+                               break;
+                       }
                        ncaps++;
                }
                if (delsys == SYS_UNDEFINED) {
-- 
1.7.9.5

thanks for Olivier GRENIE, he provided the patch.

and in xc5000.c, just add the SYS_DMBTH inside the switch-case in the function set_params.

        case SYS_DVBT:
 case SYS_DVBT2:
 case SYS_DMBTH:
  dprintk(1, "%s() OFDM\n", __func__);
  switch (bw) {
  case 6000000:
   priv->video_standard = DTV6;
   priv->freq_hz = freq - 1750000;
   break;

after patching the above changes, my atbm8830 works again. the lgs8gxx still has error. need more time to work on it.