Re: [mythtv-users] Anyone tested the DVB-T2 dual tuner TBS6280?

[Andy Walls <awalls@md.metrocast.net>]

Lawrence Rust <lvr@softsystem.co.uk> wrote:

>On Sun, 2011-08-14 at 17:50 +0200, Harald Gustafsson wrote:
>> Thanks for sharing your experience.
>> 
>[snip]
>> > Be warned that if you run a 2.6.38 or later kernel then the IR RC
>won't
>> > work because of significant changes to the RC architecture that TBS
>> > don't like (see
>http://www.tbsdtv.com/forum/viewtopic.php?f=22&t=929 and
>> > http://www.tbsdtv.com/forum/viewtopic.php?f=22&t=110&start=90#p2693
>)
>> 
>> In the links you refer to the driver author (at least he seems to be
>> the author) states that he has not upgraded to the latest IR code due
>> to compatibility issues between the CX23885 and IR.
>
>The TBS cards use the same cx23885 device that the Hauppauge HVR 1250 &
>1850 use, both of which support RC input.  The problem, as I understand
>it, is that in some modes the cx23885 can produce an interrupt storm.
>
>Given that the current v4l RC architecture is unlikely to change
>significantly in the near future then instead of bleating, perhaps TBS
>should contribute a fix.  However, given that to date all of TBS's code
>has been kept private then that's unlikely.  So the TBS Linux drivers
>are likely to become increasingly incompatible with current Linux
>kernels.
>
>I have a need to use my 6981 card so I'm developing my own fix for the
>RC problem.  I'll post this to linuxmedia when I'm happy it's sound.
>
>Incidentally, the latest TBS 6981 driver OOPS with linux 2.6.39 even
>though their release note says "Ensure compatibility with latest
>ArchLinux (with kernel 2.6.39.2-1)".  This is due to a change in an i2c
>driver structure in 2.6.39 and is a direct consequence of TBS shipping
>object modules built with old kernel headers.
>
>Be warned, the h/w is sound but the software & support suck.
>
>-- 
>Lawrence
>
>
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BTW, if it helps you develop a fix, the CX23885 IR unit is nearly identical to the IR unit and register set documented in the publicly available CX25840 datasheet.

The CX23888 IR unit is also very similar, but it is not I2C connected and has a few register differences.

Regards,
Andy