[mythtv-commits] Ticket #10153: Can't tune QPSK channels using a dvb-s2 card on Linux 3.0 or later

[MythTV]

#10153: Can't tune QPSK channels using a dvb-s2 card on Linux 3.0 or later
-------------------------------------------------+-------------------------
     Reporter:  Lawrence Rust <lvr@…>            |      Owner:  janne
         Type:  Bug Report - General             |     Status:  new
     Priority:  minor                            |  Milestone:  unknown
    Component:  MythTV - DVB                     |    Version:  Unspecified
     Severity:  medium                           |   Keywords:  dvb-s2
Ticket locked:  0                                |  linux 3.0
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 I've been trying to get my tbs6981 dvb-s2 card to work with MythTV using a
 Linux 3.0.8 or 3.1 kernel.  Turns out that there's been a change in the
 kernel that has implications for userland.

 Prior to 3.0 if the DTV_DELIVERY_SYSTEM was set to 0 (SYS_UNDEFINED) for a
 QPSK (dvb-s) channel then the dvb kernel module changed this to SYS_DVBS
 to facilitate backward support for legacy api.  From Linux 3.0 this has
 been removed.  It's a bug I believe so I've submitted a bug report & patch
 here [http://news.gmane.org/find-
 root.php?message_id=%3c1320506379.1731.12.camel%40gagarin%3e].  However,
 the time frame to get this fixed is going to be extended so a workaround
 in Myth is needed.  This bug affects both master and 0.24.1 fixes.

 The fix is to always provide a valid delivery system for
 DTV_DELIVERY_SYSTEM.  However, this may need a fix at the mysql level as
 currently all qpsk channels are recorded as having an undefined delivery
 system.

 The attached kern.log fragment shows the ioctl transactions emitted after
 {{{
 sudo sh -c "echo 1 >/sys/module/dvb_core/parameters/frontend_debug"
 }}}

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Ticket URL: <http://code.mythtv.org/trac/ticket/10153>
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