[mythtv-users] HDMI on Liva ECS

[Karl Newman]

On Mon, Jan 26, 2015 at 11:17 PM, Jerry Rubinow <jerrymr at gmail.com> wrote:

> On Mon Jan 26 2015 at 8:16:10 AM Hika van den Hoven <hikavdh at gmail.com>
> wrote:
>
>> Hoi Jerry,
>>
>> Monday, January 26, 2015, 7:36:12 AM, you wrote:
>>
>> >> Hoi Jerry,
>> >>
>> >> Sunday, January 25, 2015, 11:09:56 PM, you wrote:
>> >>
>> >> > On Sun, Jan 25, 2015 at 2:04 PM, Hika van den Hoven <
>> hikavdh at gmail.com>
>> >> > wrote:
>> >>
>> >> >> Hoi Hika,
>> >> >>
>> >> >> Sunday, January 25, 2015, 7:55:24 PM, you wrote:
>> >> >>
>> >> >> You  might also have to set something like below as boot parameters
>> on
>> >> >> your videodriver:
>> >> >>
>> >> >> modeset=1 video=HDMI-0:e
>> >> >>
>> >> >> Where  e  stands  for enable and d for disable. For the naming of
>> your
>> >> >> ports you have to look in dmesg. They differ a bit for every card.
>> >> >>
>> >> >>
>> >> > Thanks Hika.  Just putting in the modeset/video got me to the point
>> where
>> >> > I have HDMI output after boot.  While looking in dmesg for the port
>> >> name, I
>> >> > saw a bunch of errors saying the EDID checksum is invalid, which I'm
>> >> > guessing is why it decided not to activate the port.
>> >>
>> >> > At least I'm not at a dead end now.  Now to investigate that error.
>> If
>> >> > there's not an easy fix, there's surely a way for me to get the EDID
>> info
>> >> > by connecting directly to the TV and then using that to force the
>> >> > configuration when connecting through the receiver.
>>
>
Note that you *can* capture the EDID when you're directly connected to the
monitor, and then load that into the kernel to override what's detected
from your receiver. A quick search turned up this page:
https://wiki.archlinux.org/index.php/kernel_mode_setting#Forcing_modes_and_EDID
which indicates you can load the EDID via the kernel command line so you
don't have to compile your own. Note that I believe this is only for
in-kernel drivers (nVidia have their own method). It's also possible to get
tricky and edit the EDID to incorporate the audio information from your
receiver (if necessary), but in my experience that involves byte editing
(not insurmountable, but requires some research).

Karl
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