[mythtv-users] Can't start mythfrontend with TV off since moving to Intel graphics

[James Linder]

Paul, late wade in, so excuse any rubbish, and top post because THIS is thee meat, below may be of interest.

All my custom and EDID overide was of no avail to my headless backend.
xrandr dis sort out the display issues. IIRC I setup a systemd task to do it after boot
James

> Thanks for looking. I can see that it might not be feasible to workaround it cleanly if there is no way to create a valid QScreen for a disconnected display.
> 
> Given that the intel driver is open source, I'm wondering about adding to it support for the ConnectedMonitor option, but I imagine the source may frighten the hell out of me.
> 
> On 27/10/2020 21:53, Mark Kendall wrote:
>> Paul
>> OK - I see what is happening (the root cause is that the display is
>> not connected)
>> Firstly, Qt isn't sure what display it is connected to which leads to
>> this line in the logs (I'd have to check but presumably Qt ignores
>> displays that are reported as disconnected):-
>> mythdisplay.cpp:376 (GetDesiredScreen) - Display: Screen 'HDMI1' not
>> found, defaulting to primary screen (:0.0)
>> The mythtv code then tries to match :0.0 to a known display, and fails
>> with this line:-
>> platforms/mythdisplayx11.cpp:125 (GetVideoModes) - DisplayX11: Failed
>> to find an output that matches ':0.0'
>> and actually even if it tried searching for HDMI1 instead, it would
>> still fail as it will definitely ignore disconnected displays:-
>> https://github.com/MythTV/mythtv/blob/master/mythtv/libs/libmythui/platforms/mythdisplayx11.cpp#L254
>> It's easy enough to add workarounds to the MythTV side (i.e. fallback
>> to a disconnected display that has some valid modes) - but not so sure
>> about the Qt side; we rely on QScreen being valid.
>> I'll have a dig around.
>> Regards
>> Mark
>> On Tue, 27 Oct 2020 at 19:42, Paul Gardiner <lists at glidos.net> wrote:
>>> 
>>> I've recently moved from nvidia to Intel graphics for my frontend. With
>>> nvidia, I could specify CustomEDID and ConnectedMonitor options in my
>>> xorg.conf so that mythfrontend would start up before the TV was turned
>>> on, but Intel graphics doesn't support the ConnectedMonitor option and I
>>> so far can't find an alternative.
>>> 
>>> When mythfrontend starts it reports failure to find a screen and
>>> attempts to set a mode with 0fps, although xrandr correctly reports the
>>> modes specified via CustomEDID.
>>> 
>>> I've tried various alterations to no avail.
>>> 
>>> * Specifying custom edid and an enabled output via KMS, but that seemed
>>> to have no effect.
>>> 
>>> * Setting the primary output with xrandr before starting mythfrontend
>>> 
>>> * Specifying monitor definitions in the x config with the Ignore option
>>> set to True for all outputs other than HDMI1.
>>> 
>>> Nothing has worked, although the system has fooled me into thinking it
>>> is working several times.
>>> 
>>> Hope someone has some more suggestions. Here are various logs:
>>> 
>>> 
>>> 
>>> mythfrontend.log: https://pastebin.pl/view/7f7e9805
>>> 
>>> 
>>> 
>>> Xorg.0.log: https://pastebin.pl/view/96d06f27
>>> 
>>> 
>>> 
>>> xorg.conf:
>>> 
>>> Section "Monitor"
>>>      Identifier     "Monitor0"
>>>      Option         "Enable" "True"
>>> EndSection
>>> 
>>> Section "Device"
>>>      Identifier     "Device0"
>>>      Driver         "intel"
>>>      VendorName     "Intel Corporation"
>>>      Option         "CustomEDID" "HDMI1:/etc/X11/edid.bin
>>>      Option         "monitor-HDMI1" "Monitor0"
>>> EndSection
>>> 
>>> 
>>> 
>>> xrandr output:
>>> 
>>> Screen 0: minimum 8 x 8, current 1024 x 768, maximum 32767 x 32767
>>> DP1 disconnected primary (normal left inverted right x axis y axis)
>>> HDMI1 disconnected (normal left inverted right x axis y axis)
>>>     1920x1080     50.00 +  60.00    24.00
>>>     1920x1080i    50.00    60.00
>>>     1280x1024     60.02
>>>     1280x720      50.00    60.00
>>>     1440x576i     50.00
>>>     1024x768      60.00
>>>     1440x480i     59.94
>>>     800x600       60.32
>>>     720x576       50.00
>>>     720x480       59.94
>>>     640x480       59.94
>>> HDMI2 disconnected (normal left inverted right x axis y axis)
>>> VIRTUAL1 disconnected (normal left inverted right x axis y axis)
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