[Intel-gfx] Does the intel driver support faking a connected monitor?

[Intel-gfx] Does the intel driver support faking a connected monitor?

[Paul Gardiner]

I use an open source DVR called MythTV. I've just swapped from using 
nvidia graphics to intel graphics. Generally it's working great, but 
I've run into one thing I used to do with the old system that I cannot 
find out how to achieve with the new.

MythTV doesn't currently entirely handle starting without a TV 
connected. With nvidia graphics I could specify, within the X config, 
the "ConnectMonitor" and "CustomEDID" options to fool MythTV into 
thinking there was a TV. With intel graphics I can load EDID, but so far 
I haven't discovered an equivalent of the "ConnectedMonitor" option.
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Re: [Intel-gfx] Does the intel driver support faking a connected monitor?

[Jani Nikula]

On Thu, 29 Oct 2020, Paul Gardiner <lists@glidos.net> wrote:
> I use an open source DVR called MythTV. I've just swapped from using 
> nvidia graphics to intel graphics. Generally it's working great, but 
> I've run into one thing I used to do with the old system that I cannot 
> find out how to achieve with the new.
>
> MythTV doesn't currently entirely handle starting without a TV 
> connected. With nvidia graphics I could specify, within the X config, 
> the "ConnectMonitor" and "CustomEDID" options to fool MythTV into 
> thinking there was a TV. With intel graphics I can load EDID, but so far 
> I haven't discovered an equivalent of the "ConnectedMonitor" option.

Sorry for the delay, I seem to have missed this.

Please try a kernel command-line parameter to force enable the
connector.

video=TV-1:e

Assuming the connector name is "TV-1"; replace with whatever you have.


BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center
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Re: [Intel-gfx] Does the intel driver support faking a connected monitor?

[Paul Gardiner]

On 17/11/2020 14:52, Jani Nikula wrote:
> On Thu, 29 Oct 2020, Paul Gardiner <lists@glidos.net> wrote:
>> I use an open source DVR called MythTV. I've just swapped from using
>> nvidia graphics to intel graphics. Generally it's working great, but
>> I've run into one thing I used to do with the old system that I cannot
>> find out how to achieve with the new.
>>
>> MythTV doesn't currently entirely handle starting without a TV
>> connected. With nvidia graphics I could specify, within the X config,
>> the "ConnectMonitor" and "CustomEDID" options to fool MythTV into
>> thinking there was a TV. With intel graphics I can load EDID, but so far
>> I haven't discovered an equivalent of the "ConnectedMonitor" option.
> 
> Sorry for the delay, I seem to have missed this.
> 
> Please try a kernel command-line parameter to force enable the
> connector.
> 
> video=TV-1:e
> 
> Assuming the connector name is "TV-1"; replace with whatever you have.


Thanks for the reply. I gave that a try, in my case "video=HDMI1:e", but 
saw no difference. That's KMS, right? Is there anything I might have 
failed to install or enable that KMS relies on? Are there any logs I 
should monitor?
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Re: [Intel-gfx] Does the intel driver support faking a connected monitor?

[Jani Nikula]

On Sat, 21 Nov 2020, Paul Gardiner <lists@glidos.net> wrote:
> On 17/11/2020 14:52, Jani Nikula wrote:
>> On Thu, 29 Oct 2020, Paul Gardiner <lists@glidos.net> wrote:
>>> I use an open source DVR called MythTV. I've just swapped from using
>>> nvidia graphics to intel graphics. Generally it's working great, but
>>> I've run into one thing I used to do with the old system that I cannot
>>> find out how to achieve with the new.
>>>
>>> MythTV doesn't currently entirely handle starting without a TV
>>> connected. With nvidia graphics I could specify, within the X config,
>>> the "ConnectMonitor" and "CustomEDID" options to fool MythTV into
>>> thinking there was a TV. With intel graphics I can load EDID, but so far
>>> I haven't discovered an equivalent of the "ConnectedMonitor" option.
>> 
>> Sorry for the delay, I seem to have missed this.
>> 
>> Please try a kernel command-line parameter to force enable the
>> connector.
>> 
>> video=TV-1:e
>> 
>> Assuming the connector name is "TV-1"; replace with whatever you have.
>
>
> Thanks for the reply. I gave that a try, in my case "video=HDMI1:e", but 
> saw no difference. That's KMS, right? Is there anything I might have 
> failed to install or enable that KMS relies on? Are there any logs I 
> should monitor?

I think it should probably be HDMI-1 with the hyphen; is that a typo
above or in the command line you used?

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center
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Re: [Intel-gfx] Does the intel driver support faking a connected monitor?

[Paul Gardiner]

On 23/11/2020 16:19, Jani Nikula wrote:
> On Sat, 21 Nov 2020, Paul Gardiner <lists@glidos.net> wrote:
>> On 17/11/2020 14:52, Jani Nikula wrote:
>>> On Thu, 29 Oct 2020, Paul Gardiner <lists@glidos.net> wrote:
>>>> I use an open source DVR called MythTV. I've just swapped from using
>>>> nvidia graphics to intel graphics. Generally it's working great, but
>>>> I've run into one thing I used to do with the old system that I cannot
>>>> find out how to achieve with the new.
>>>>
>>>> MythTV doesn't currently entirely handle starting without a TV
>>>> connected. With nvidia graphics I could specify, within the X config,
>>>> the "ConnectMonitor" and "CustomEDID" options to fool MythTV into
>>>> thinking there was a TV. With intel graphics I can load EDID, but so far
>>>> I haven't discovered an equivalent of the "ConnectedMonitor" option.
>>>
>>> Sorry for the delay, I seem to have missed this.
>>>
>>> Please try a kernel command-line parameter to force enable the
>>> connector.
>>>
>>> video=TV-1:e
>>>
>>> Assuming the connector name is "TV-1"; replace with whatever you have.
>>
>>
>> Thanks for the reply. I gave that a try, in my case "video=HDMI1:e", but
>> saw no difference. That's KMS, right? Is there anything I might have
>> failed to install or enable that KMS relies on? Are there any logs I
>> should monitor?
> 
> I think it should probably be HDMI-1 with the hyphen; is that a typo
> above or in the command line you used?

Thanks for the continued help. I tried "video=HDMI1:e" because my Xorg 
log listed outputs HDMI1, HDMI2, DP1 and VIRTUAL1. I've now tried 
"video=HDMI-1:e", but still no luck.
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Re: [Intel-gfx] Does the intel driver support faking a connected monitor?

[Paul Gardiner]

On 24/11/2020 15:03, Paul Gardiner wrote:
> On 23/11/2020 16:19, Jani Nikula wrote:
>> On Sat, 21 Nov 2020, Paul Gardiner <lists@glidos.net> wrote:
>>> On 17/11/2020 14:52, Jani Nikula wrote:
>>>> On Thu, 29 Oct 2020, Paul Gardiner <lists@glidos.net> wrote:
>>>>> I use an open source DVR called MythTV. I've just swapped from using
>>>>> nvidia graphics to intel graphics. Generally it's working great, but
>>>>> I've run into one thing I used to do with the old system that I cannot
>>>>> find out how to achieve with the new.
>>>>>
>>>>> MythTV doesn't currently entirely handle starting without a TV
>>>>> connected. With nvidia graphics I could specify, within the X config,
>>>>> the "ConnectMonitor" and "CustomEDID" options to fool MythTV into
>>>>> thinking there was a TV. With intel graphics I can load EDID, but 
>>>>> so far
>>>>> I haven't discovered an equivalent of the "ConnectedMonitor" option.
>>>>
>>>> Sorry for the delay, I seem to have missed this.
>>>>
>>>> Please try a kernel command-line parameter to force enable the
>>>> connector.
>>>>
>>>> video=TV-1:e
>>>>
>>>> Assuming the connector name is "TV-1"; replace with whatever you have.
>>>
>>>
>>> Thanks for the reply. I gave that a try, in my case "video=HDMI1:e", but
>>> saw no difference. That's KMS, right? Is there anything I might have
>>> failed to install or enable that KMS relies on? Are there any logs I
>>> should monitor?
>>
>> I think it should probably be HDMI-1 with the hyphen; is that a typo
>> above or in the command line you used?
> 
> Thanks for the continued help. I tried "video=HDMI1:e" because my Xorg 
> log listed outputs HDMI1, HDMI2, DP1 and VIRTUAL1. I've now tried 
> "video=HDMI-1:e", but still no luck.

Not wishing to hassle you, but before I give up, any further thoughts on 
this?  I have a solution at least, which is to use a EDID emulator, so 
it's no great inconvenience how it is.

Cheers,
	Paul.
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Re: [Intel-gfx] Does the intel driver support faking a connected monitor?

[Jani Nikula]

On Fri, 04 Dec 2020, Paul Gardiner <lists@glidos.net> wrote:
> On 24/11/2020 15:03, Paul Gardiner wrote:
>> On 23/11/2020 16:19, Jani Nikula wrote:
>>> On Sat, 21 Nov 2020, Paul Gardiner <lists@glidos.net> wrote:
>>>> On 17/11/2020 14:52, Jani Nikula wrote:
>>>>> On Thu, 29 Oct 2020, Paul Gardiner <lists@glidos.net> wrote:
>>>>>> I use an open source DVR called MythTV. I've just swapped from using
>>>>>> nvidia graphics to intel graphics. Generally it's working great, but
>>>>>> I've run into one thing I used to do with the old system that I cannot
>>>>>> find out how to achieve with the new.
>>>>>>
>>>>>> MythTV doesn't currently entirely handle starting without a TV
>>>>>> connected. With nvidia graphics I could specify, within the X config,
>>>>>> the "ConnectMonitor" and "CustomEDID" options to fool MythTV into
>>>>>> thinking there was a TV. With intel graphics I can load EDID, but 
>>>>>> so far
>>>>>> I haven't discovered an equivalent of the "ConnectedMonitor" option.
>>>>>
>>>>> Sorry for the delay, I seem to have missed this.
>>>>>
>>>>> Please try a kernel command-line parameter to force enable the
>>>>> connector.
>>>>>
>>>>> video=TV-1:e
>>>>>
>>>>> Assuming the connector name is "TV-1"; replace with whatever you have.
>>>>
>>>>
>>>> Thanks for the reply. I gave that a try, in my case "video=HDMI1:e", but
>>>> saw no difference. That's KMS, right? Is there anything I might have
>>>> failed to install or enable that KMS relies on? Are there any logs I
>>>> should monitor?
>>>
>>> I think it should probably be HDMI-1 with the hyphen; is that a typo
>>> above or in the command line you used?
>> 
>> Thanks for the continued help. I tried "video=HDMI1:e" because my Xorg 
>> log listed outputs HDMI1, HDMI2, DP1 and VIRTUAL1. I've now tried 
>> "video=HDMI-1:e", but still no luck.
>
> Not wishing to hassle you, but before I give up, any further thoughts on 
> this?  I have a solution at least, which is to use a EDID emulator, so 
> it's no great inconvenience how it is.

This should work. ISTR it's been used before by MythTV users. (I don't
know what you refer to with EDID emulator.)

Please file a bug over at [1]. Add drm.debug=14 module parameter, and
attach full dmesg from boot to reproducing the problem in the bug.

BR,
Jani.


[1] https://gitlab.freedesktop.org/drm/intel/-/issues/new

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Re: [Intel-gfx] Does the intel driver support faking a connected monitor?

[Paul Gardiner]

On 09/12/2020 10:19, Jani Nikula wrote:
> On Fri, 04 Dec 2020, Paul Gardiner <lists@glidos.net> wrote:
>> On 24/11/2020 15:03, Paul Gardiner wrote:
>>> On 23/11/2020 16:19, Jani Nikula wrote:
>>>> On Sat, 21 Nov 2020, Paul Gardiner <lists@glidos.net> wrote:
>>>>> On 17/11/2020 14:52, Jani Nikula wrote:
>>>>>> On Thu, 29 Oct 2020, Paul Gardiner <lists@glidos.net> wrote:
>>>>>>> I use an open source DVR called MythTV. I've just swapped from using
>>>>>>> nvidia graphics to intel graphics. Generally it's working great, but
>>>>>>> I've run into one thing I used to do with the old system that I cannot
>>>>>>> find out how to achieve with the new.
>>>>>>>
>>>>>>> MythTV doesn't currently entirely handle starting without a TV
>>>>>>> connected. With nvidia graphics I could specify, within the X config,
>>>>>>> the "ConnectMonitor" and "CustomEDID" options to fool MythTV into
>>>>>>> thinking there was a TV. With intel graphics I can load EDID, but
>>>>>>> so far
>>>>>>> I haven't discovered an equivalent of the "ConnectedMonitor" option.
>>>>>>
>>>>>> Sorry for the delay, I seem to have missed this.
>>>>>>
>>>>>> Please try a kernel command-line parameter to force enable the
>>>>>> connector.
>>>>>>
>>>>>> video=TV-1:e
>>>>>>
>>>>>> Assuming the connector name is "TV-1"; replace with whatever you have.
>>>>>
>>>>>
>>>>> Thanks for the reply. I gave that a try, in my case "video=HDMI1:e", but
>>>>> saw no difference. That's KMS, right? Is there anything I might have
>>>>> failed to install or enable that KMS relies on? Are there any logs I
>>>>> should monitor?
>>>>
>>>> I think it should probably be HDMI-1 with the hyphen; is that a typo
>>>> above or in the command line you used?
>>>
>>> Thanks for the continued help. I tried "video=HDMI1:e" because my Xorg
>>> log listed outputs HDMI1, HDMI2, DP1 and VIRTUAL1. I've now tried
>>> "video=HDMI-1:e", but still no luck.
>>
>> Not wishing to hassle you, but before I give up, any further thoughts on
>> this?  I have a solution at least, which is to use a EDID emulator, so
>> it's no great inconvenience how it is.
> 
> This should work. ISTR it's been used before by MythTV users. (I don't
> know what you refer to with EDID emulator.)
> 
> Please file a bug over at [1]. Add drm.debug=14 module parameter, and
> attach full dmesg from boot to reproducing the problem in the bug.
> 
> BR,
> Jani.
> 
> 
> [1] https://gitlab.freedesktop.org/drm/intel/-/issues/new

The debug output was sufficient to track down the problem. It turned out 
that the connection was called HDMI-A-1. When I used that name your 
previous suggestion worked. To get exactly the behaviour I wanted I 
needed to also load EDID. This is the extra boot command string I'm using:

     drm.edid_firmware=HDMI-A-1:edid/marantz_edid.bin video=HDMI-A-1:D


For that to work I also had to ensure the referenced edid file was in my 
initramfs.

Thanks again for the help.

By the way, an EDID emulator is a small USB-stick-sized device that sits 
in between computer and monitor and acts like a monitor when the actual 
monitor is off.
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Re: [Intel-gfx] Does the intel driver support faking a connected monitor?

[Jani Nikula]

On Sun, 20 Dec 2020, Paul Gardiner <lists@glidos.net> wrote:
> The debug output was sufficient to track down the problem. It turned out 
> that the connection was called HDMI-A-1. When I used that name your 
> previous suggestion worked. To get exactly the behaviour I wanted I 
> needed to also load EDID. This is the extra boot command string I'm using:
>
>      drm.edid_firmware=HDMI-A-1:edid/marantz_edid.bin video=HDMI-A-1:D
>
>
> For that to work I also had to ensure the referenced edid file was in my 
> initramfs.
>
> Thanks again for the help.

I'm glad you figured it out, and thanks for letting us know!

> By the way, an EDID emulator is a small USB-stick-sized device that sits 
> in between computer and monitor and acts like a monitor when the actual 
> monitor is off.

Ah, thanks for the info.


BR,
Jani.

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