[mythtv-users] USB IR Receivers

[Jerry Rubinow]

On Wed, Sep 2, 2015 at 9:28 AM, Kirk Bocek <t004 at kbocek.com> wrote:

>
>
> On 9/1/2015 6:41 PM, Roger Heflin wrote:
>
>> Kirk,
>>
>> You *MUST* have an adjusted kernel to make certain USB devices work on
>> Liva.  There was an earlier post about this with this link on it:  It
>> is a pain, it may be a kernel bug the notes I originally found this
>> info from was from someone elses kernel patch.
>>
>>
>> http://www.gossamer-threads.com/lists/mythtv/users/587930?search_string=jerry;#587930
>>
>> Jerry used the directions I worked out on mine and that also fixed
>> his.  There is something funny in the kernel in regards to it appears
>> some usb (possibly usb1 low speed) devices on the usb3.  On the liva
>> both ports appear to be controlled by the same usb3 chipset so both
>> ports have the issue.
>>
>> Without the patch I was getting completely different garbage each time
>> pushing the same key.
>>
>>
>>
> This is my second Liva. On my first Liva, I am using an *ancient*
> Microsoft branded USB IR receiver. It totally works with LIRC and the stock
> Fedora kernel. No questions asked. I've got the unit serving us in the
> bedroom now and it works great.
>
> My original question was, what commercially available IR receiver are you
> using with Myth now? I guess I should have asked what is available that
> works with standard Linux distros and LIRC? Because right now this Chinese
> unit clearly isn't. Alec has given me a work-around that sounds like it
> *should* work. But so far that isn't helping.
>
> My other generic MCE receiver that works under CentOS 6 and it's older
> kernel seems to have stopped working under the 4.1.5 kernel of Fedora 21
> too.
>
> I bought an HP IR receiver on Amazon hoping it would work. When it failed
> like this one I threw it in the trash. I probably should have held on to it
> so I could try these work arounds. but man, that felt *good.*
>

The problem I ran into - and I'm not saying you are having the same
problem, I don't know - but what I encountered was a result of a
combination of the kernel usb driver, the Liva USB hardware, and the
particular mce ir receiver I was using.  That is, I could use the exact
same kernel and ir receiver on a different computer and not have the issue.


On the Liva both USB ports go through xHCI.  The ir receiver I have uses an
older h/w protocol which the kernel driver does not process properly when
going through xHCI.  On a different computer, going through a USB 2.0 port,
this issue does not happen.  The Liva's 2.0 port however uses xHCI.

Jerry
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