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

[Mark Kendall]

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)
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-users
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org