[mythtv-users] Trying To Get Two IR Receivers Working

[Jerry Rubinow]

On Wed, Oct 21, 2015 at 3:53 PM, Jerry Rubinow <jerrymr at gmail.com> wrote:

> On Wed, Oct 21, 2015 at 2:30 PM, Kirk Bocek <t004 at kbocek.com> wrote:
>
>>
>>
>> On 10/19/2015 1:02 PM, Jerry Rubinow wrote:
>>
>>> Hi Kirk,
>>>
>>> If you want context, look at this archived thread:
>>>
>>>
>>> http://www.gossamer-threads.com/lists/engine?do=post_view_flat;post=587593;page=1;mh=-1;list=mythtv;sb=post_latest_reply;so=ASC
>>>
>>> in which I went through similar frustration as you that was related to
>>> the USB 2.0/3.0 issue.  It's a long thread and there are a lot of dead
>>> ends, so look in particular for the last reply from Nick Morrott which
>>> points to a discussion of the kernel patch.
>>>
>>> If you want to go straight to the patch discussion:
>>> http://ubuntuforums.org/showthread.php?t=2203116.
>>>
>>> -Jerry
>>>
>>>
>> Many thanks for these links Jerry.
>>
>> I just don't know if this is my problem. These posts are quite old and
>> refer to the 3.6 kernel. I'm working with Fedora 22 and the 4.1 kernel. If
>> these are important patches wouldn't they have been worked in already?
>>
>> I'm disheartened that the experts here weren't able to help me.
>> *Especially* with the older receiver that *was* working with CentOS. So
>> yeah, some fundamental problem here: xhci, ECS Liva, the Feng Shui in my
>> office? Most frustrating.
>>
>> When I get time, I think I'll try Fedora 23 Beta and see what happens. I
>> think I saw a post elsewhere that Alec was pushing lirc 0.9.3 into Fedora
>> 23.
>>
>>
> Kirk, I tried putting both Ubuntu 14.04 and 15.04 (so I think up through
> kernel 3.19) on the Liva, and both had the problem in irw with broken
> non-constant codes being reported.
>
> I don't know about your other problem, but the issue with xHCI still
> persisted with more recent kernels than 3.6.  I don't know about 4.x, but I
> should try that once ubuntu 15.10 drops.  Patching the low level xHCI
> driver fixed it for me.  I believe this is not fixable in lirc, since the
> data will still be going through the xHCI driver underneath, but this is
> not my specialty so I won't swear to it.  You can look at the driver file
> in the kernel repository browser to see if it changed since 3.19.
>

Kirk, I checked the 4.2.4 and 4.3-rc6 kernel source and it does not have
the fix.   I imagine this is because it may only be an issue with the
combination of Liva's weird USB hardware and particular types of IR
receivers, and it's not on the radar.  I looked through the link I sent you
and it actually doesn't have the right fix (the one that worked for me).
Here it is simply.

In drivers/usb/core/config.c, in the default case of the switch statement
at line 219 (in 4.2.4 anyway), there is a line "n = 32;".  Change it to "n
= 10;".  Here's a link to the file:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/usb/core/config.c?id=refs/tags/v4.2.4

-Jerry
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