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

[Jani Nikula]

On Fri, 04 Dec 2020, Paul Gardiner <lists at 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 at glidos.net> wrote:
>>>> On 17/11/2020 14:52, Jani Nikula wrote:
>>>>> On Thu, 29 Oct 2020, Paul Gardiner <lists at 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

-- 
Jani Nikula, Intel Open Source Graphics Center