[mythtv-users] Report: Watch out! UB435-Q V2 is NOT the same as UB435-Q

Martin, Charles cmart at dolby.com
Fri Apr 29 19:11:20 UTC 2011

Hi all -
   So what's going on with this?  I actually need to get this going.
Jarod, Devin, any further news?
I'm also willing to help, if you want to collaborate.
Thanks, Charles.
On Oct 29, 2010, at 2:37 PM, Devin Heitmueller wrote:
> On Fri, Oct 29, 2010 at 2:04 PM, Jarod Wilson <jarod at wilsonet.com
<http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users> > wrote:
>> On Oct 15, 2010, at 6:07 PM, Jarod Wilson wrote:
>>> On Fri, Oct 15, 2010 at 12:10 AM, Steven Willoughby <mythtv at
thesteve.org <http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users> >
>>>> Hello Mr. Wilson,
>>>>    Sorry for breaking the thread, I am new to the list as I just
received my
>>>> V2 today.
>>>>    I have applied your patch [1] against the v4l-dvb source tree
[2] but it
>>>> doesn't seem to work.  I get the following in dmesg:
>>>>  em28xx video device (1b80:e346): interface 0, class 255 found.
>>>>  em28xx This is an anciliary interface not used by the driver
>>>>  usbcore: registered new interface driver em28xx
>>>>  em28xx driver loaded
>>>>    It is quite possible that I am not testing it right.  I'm new to
>>>>  I have tried using mplayer and tvtime but there isn't a
/dev/video* device.
>>> Nah, I'd expect to see way more spew than that if the stick was
>>> properly brought up, and the 'ancillary' stuff is unexpected. Means
>>> the quick hack patch isn't enough to get it working. Someone with
>>> stick is going to have to experiment. Or they could guilt me into
>>> working on it by sending me a stick too (though I'm already
>>> with other hardware I really ought to be working on first...). ;)
>> So a spot of bad news here... I've been poking at one of Gavin's
sticks inside a VM he set up for me, simultaneous with talking to one of
the upstream em28xx driver authors. We now have a very good
understanding of why the stick isn't working.
>> All known prior em28xx-based tuner sticks have had at least one
isochronous usb endpoint, with a max packet size of 940 bytes,
typically. This stick only has bulk usb endpoints and a max packet size
of 512. Supporting this stick is actually going to require a fair bit of
work in the em28xx driver core to support using bulk transfer instead of
isochronous transfer.
>> Short version: don't buy this stick right now, its going to be a
little while before its actually supported.
> Jarod,
> Just an FYI:  bulk support for em2874/em2884 is on my todo list for
> the near future.
Ah, very cool. I'm inclined to wait and let you do that part, since you
know em28xx much better than I do, and I'll just focus on the
device-specific implementation details (gpio settings, wiring up tuner
and demod, etc). I'm assuming you have some other manufacturer's
em2874/em2884 based devices to work on this for... :)



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