[mythtv-users] Issues since upgrading to 0.25

Karl Newman newmank1 at asme.org
Mon Jun 4 15:12:34 UTC 2012

On Fri, Jun 1, 2012 at 9:32 PM, Andrew Stadt <acstadt at stadt.ca> wrote:
> On 01/06/2012 11:56 PM, Nick Rout wrote:
>> On Sat, Jun 2, 2012 at 5:48 AM, Enigma<enigma at thedonnerparty.com>  wrote:
>>> 5. Audio.  This is more of a configuration issue but any input would be
>>> appreciated.  I have a new frontend (Asus eeeBox EB1012p) hooked to an
>>> HDTV
>>> (Philips 46PFL5706/F7).  Currently, I am outputting audio over HDMI to
>>> the
>>> TV and using a digital audio passthrough output on the TV to provide the
>>> stream to my receiver.  The issue is that this configuration only allows
>>> me
>>> to select stereo output even though my receiver is capable of 5.1.  Is
>>> this
>>> because I am using HDMI and the TV only has 2 speakers?  Is there any way
>>> to
>>> use HDMI audio in this manner to get full 5.1 audio or does the frontend
>>> need to output directly to the receiver to get anything more than stereo?
>> Some TVs only output stereo over their spdif out connector. So it's
>> hard to say where the problem lies.
>> Does your receiver have HDMI inputs? If so you may be better with
>> mythbox->receiver->TV
> Never saw the op's post, so:
> The trouble is with his setup is that the eeeBox is only seeing the edid
> info from the TV (which probably only says it supports 2 channel stereo).
>  Really he has two options, the easiest, as you suggested, (if possible) is
> to go to the receiver then the TV.  The other option is to hack the edid
> extended data block and then load the hacked block with nVidia's customEdid
> option.
> I'm not entirely sure this would work with the latest nvidia drivers (they
> seemed to have changed some of the edid handling/validation), but you
> theoretically could plug the computer into the receiver, capture the
> receiver's edid, plug into the TV, get a mode debug of the TV's edid.  Build
> a set of custom modelines for Xorg based on the TV's edid.  In xorg.conf,
> load the receiver's edid instead of the display's edid (via the customEdid
> option), but then force X to use your custom modelines for the display. The
> catch hear is that you can't ignore the edid after loading a customEdid (at
> least in my experience) so you have to use the modevalidation, noedidmodes,
> usedisplaydevice, connectedmonitor, dpi, and exactmodetimingsdvi options to
> accomplish your overrides. FWIW, I had done something similiar to this on
> one machine, but in the end went and out and got a better receiver - still
> had to use the custom modelines to get the most out of the display (and
> which also incidentally fixed a few other minor issues with Xorg) but at
> least the audio just worked.
> Cheers,
> Andrew.

The recently released kernel 3.4 has the ability to load a custom EDID
directly in the kernel, so if you can come up with a suitable extended
EDID you may be able to avoid all the overrides in Xorg. However, it
may apply only to in-kernel drivers; I'm not sure how it will interact
with the nVidia binary drivers. Might be worth looking at if you're
going to go to the trouble of creating an EDID anyway.


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