[mythtv-users] HDMI - no signal
Monkey Pet
monkeypet at gmail.com
Wed Jan 8 17:06:22 UTC 2014
On Wed, Jan 8, 2014 at 8:40 AM, Mick Sulley <mick at sulley.info> wrote:
> 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 :-) )
Hi, I my samsung TV is very finicky about the HDMI port connect to the PC.
Whenever, i switch between inputs HDMI1 (chromecast) --> HDMI2 (mac-mini
running ubuntu), the screen becomes snowy. In order to reset the TV, i had
to turn switch to the HDMI input, then switch the TV on/off.
I also ran into a very weird issue where the color depth wasn't being set
correctly, so i had to manually set some registers
http://ubuntuforums.org/showthread.php?t=2118053&p=12523426#post12523426.
This most likely isn't your issue.
If you can't figure it out, find out the version of X in your distribution
and try another distribution with a different version, you might get lucky.
>
>
>
>
> 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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