[mythtv-users] HDMI - no signal

Wed Jan 8 00:55:05 UTC 2014



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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