[mythtv-users] HDMI - no signal

Wed Jan 8 16:40:53 UTC 2014

Firstly thank you all for taking the trouble to try to help me out with 
this, much appreciated!

Resolution - the manual is vague on most things, but it says that 
HDMI/DVI supports 720p and 1080i at both 50Hz and 60Hz

HDMI connection - there is only one HDMI port, so no change of selecting 
the wrong one.

As someone pointed out it does say in the manual under that connection 
'Not compatible with PC', which is a bit of a worry, however I had tried 
it with my laptop and that worked, although it seem to see it as screen 
2.  Today I have tried plugging my newly built desktop into it and that 
works as well.  That has a Asus GT 610 Silent 2GB DDR3 VGA DVI HDMI 
PCI-E Graphics Card.  That works OK so I am now thinking that if I get a 
similar card for the Myth box (needs to be low profile to fit in) then 
that should fix it.

I am also thinking that the current TV is not that brilliant, so maybe 
time to invest in a new one (but that will need wifely approval :-) )

On 08/01/14 00:55, PJR wrote:
>
>
>
> On 07/01/14 17:15, Mick Sulley wrote:
>> 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.
>>>
>> Ok, it's a long time since I went through this stuff but first answer
>> 2 questions: 1) what's the screen resolution of your Samsung TV?  Is
>> it 'normally' 1080x1024?; 2) have you set the TV to take HDMI input on
>> the HDMI socket the cable is connected to?  My Samsung TV has 3 HDMI
>> input ports and you have to select the right one, ie the one the HDMI
>> cable is plugged into (sounds pretty basic but distance diagnosis is
>> tricky).  Your Xorg output when connected to the TV says it's decided
>> to use 720x400 at 70Hz which is highly unlikely, I would have expected
>> 1080x1024 at 60Hz.  As I recall the EDID is a file that Xorg can use and
>> during it's setsup rather than working some of it out. If you haven't
>> got the file then it shouldn't matter since Xorg will work out all the
>> settings needed when it's connected to display device, ie your TV.
>> Since it seems to get the wrong results it might suggest it's not
>> talking to the TV via the HDMI port, just a guess at the moment.  I
>> have two MythTV systems which can be connected to the same TV.  The
>> first, the older of the two doesn't use the EDID but Xorg gets the
>> correct results.  The second does use the EDID and also works, ie it
>> doesn't matter if you've got the EDID or not (there are some
>> differences but not of the order of it working or not).  The only log
>> which is needed is the HDMI one, if that can be sent in full do so.
>> You should be able to roll the log files so it starts a new one, then
>> reboot and it will just contain the output from that start, I can't
>> remember how to do that but I'm sure you can find out.
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