[mythtv-users] HDMI - no signal

[Mick Sulley]

Thanks for the replies, I tried to reply with the log files but fell 
foul of the size limits.

Comparing the logs it looks like the difference areas are -
Working -
[    31.564] (II) intel(0): EDID for output VGA1
[    31.580] (II) intel(0): EDID for output HDMI1
[    31.628] (II) intel(0): EDID for output DP1
[    32.204] (II) intel(0): EDID for output HDMI2
[    32.204] (II) intel(0): Manufacturer: CVT  Model: 3  Serial#: 0
[    32.204] (II) intel(0): Year: 2010  Week: 16
[    32.204] (II) intel(0): EDID Version: 1.3
[    32.204] (II) intel(0): Digital Display Input
[    32.204] (II) intel(0): Max Image Size [cm]: horiz.: 100  vert.: 61
[    32.204] (II) intel(0): Gamma: 1.00
[    32.204] (II) intel(0): DPMS capabilities: StandBy
[    32.204] (II) intel(0): Supported color encodings: RGB 4:4:4 YCrCb 
4:4:4
[    32.204] (II) intel(0): First detailed timing is preferred mode
[    32.204] (II) intel(0): redX: 0.640 redY: 0.330   greenX: 0.300 
greenY: 0.600
[    32.204] (II) intel(0): blueX: 0.150 blueY: 0.060   whiteX: 0.313 
whiteY: 0.329
[    32.204] (II) intel(0): Supported established timings:
[    32.204] (II) intel(0): 720x400 at 70Hz

Not working -
[    30.428] (II) intel(0): EDID for output VGA1
[    30.428] (II) intel(0): Manufacturer: SAM  Model: 211  Serial#: 0
[    30.428] (II) intel(0): Year: 2005  Week: 49
[    30.428] (II) intel(0): EDID Version: 1.3
[    30.428] (II) intel(0): Analog Display Input,  Input Voltage Level: 
0.700/0.700 V
[    30.428] (II) intel(0): Sync:  Separate
[    30.428] (II) intel(0): Max Image Size [cm]: horiz.: 93  vert.: 53
[    30.428] (II) intel(0): Gamma: 2.20
[    30.428] (II) intel(0): No DPMS capabilities specified; RGB/Color 
Display
[    30.428] (II) intel(0): First detailed timing is preferred mode
[    30.428] (II) intel(0): redX: 0.640 redY: 0.330   greenX: 0.300 
greenY: 0.600
[    30.428] (II) intel(0): blueX: 0.150 blueY: 0.060   whiteX: 0.312 
whiteY: 0.329
[    30.428] (II) intel(0): Supported established timings:
[    30.428] (II) intel(0): 720x400 at 70Hz

Going through there are several other areas where they differ, but I am 
really not sure what I should be looking for.  Can you tell me what info 
would be useful in these files?  Is there any way to upload them so you 
can see them?

Further research turned up many comments about changes to the xorg.conf 
file related to EDID, but I don't have that file, could that be the 
problem?

Thanks for your help
Mick

On 07/01/14 16:47, Mike Perkins wrote:
> On 07/01/14 11:03, PJR wrote:
>>
>>
>>
>> On 07/01/14 00:00, Mick Sulley wrote:
>>> I have set up my myth box, latest Mythbuntu, and got it working with a
>>> small TV in the study, now time to move it to the lounge.  I plug it
>>> all in via HDMI and the TV displays 'No Signal'.  I plug my laptop in
>>> via that same HDMI lead and it works.
>>>
>>> TV and HDMI lead are OK as they work with my laptop.
>>>
>>> Myth box is OK as it works with the small TV in the study.
>>>
>>> Why does the Myth box not work with the big TV?
>>>
>>> The Myth box is using on board graphics on a Gigabyte SKT-1156
>>> Q57M-S2H Motherboard
>>> The TV is a Samsung PS42E7HX/XEC
>>>
>>
>> I suggest taking a look at /var/log/Xorg0.log for when both TVs are
>> connected, this may give some suggestion as to the problem.  You may of
>> course have already done this, if so why not include it in your next
>> posting.  I would add that my Samsung HDMI TV has to be specifically
>> configured to use one of its HDMI inputs; I have used it only with
>> Nvidia graphics cards.
>>
> I second that suggestion, and also offer: it may depend on which order 
> everything is powered up.
>