config.txt settings apply to the old, deprecated firmware display driver.
cmdline.txt is the standard linux way of configuring display modes. e.g. see here.
Something like:
video=HDMI-A-1:1280x720@60D
Added to cmdline.txt (on end of same line).
That worked and I was able to get a picture! Yay! However audio does not work now and adjusting both the audio output device and the resolution in the GUI is not possible. Both are grayed out and I am not able to change the settings in the GUI.
It's strange because the TV does appear capable of 1080p. If I plug my laptop into the TV with an HDMI cable it comes up as 1920x1080 60Hz and I get a picture. So the TV does seem capable. If I get rid of the cmdline.txt change that you gave me, I am back to a black screen. But now that I have at least gotten it to boot up with picture, I was able to get the Wifi connected and now I am able to log in via ssh and make adjustments that way.
If I let it boot up normally without your cmdline.txt alteration, I then log in via ssh and open /storage/.kodi/userdata/guisettings.xml
this section seems relevant:
<resolutions>
<resolution>
<description>1280x720 @ 60.000000 Hz</description>
<subtitles>673</subtitles>
<pixelratio>1.000000</pixelratio>
<overscan>
<left>24</left>
<top>15</top>
<right>1259</right>
<bottom>706</bottom>
</overscan>
</resolution>
</resolutions>
If I edit that and change
<description>1280x720 @ 60.000000 Hz</description>
to
<description>1920x1080 @ 60.000000 Hz</description>
then reboot, I still get black screen
when I open /storage/.kodi/userdata/guisettings.xml
<description>1920x1080 @ 60.000000 Hz</description>
has reverted to
<description>1280x720 @ 60.000000 Hz</description>
I did a video calibration after my successful boot with cmdline.txt and I believe all the settings in <resolutions> are from that successful boot, because I can see the overscan section is filled out...
I'd like to be able to get it to boot up without using the cmdline.txt so that I can then make adjustments via the GUI
I suppose the other option is to add an audio config in addition to the video config in cmdline.txt
-I don't know how to do that, perhaps you can tell me how to add an audio line with HDMI as the audio output?
Right now in the GUI "Audio output device" is grayed out, I can not change it. The setting is "Default,Bluetooth Audio(PULSEAUDIO)"
I would think Default would be HDMI, but as I said I don't get any audio. No GUI sounds, and when I play a video no audio there either...
Ideally I'd like to get things working in 1080P, since I know the TV is capable with my laptop....
But at minimum I'd like to at least get audio working...
Thank you for the help. Definitely happy I am moving in the right direction
It's difficult because when googling, all the advice is to make changes to config.txt. But now I know that is deprecated. Tough to find relevant advice for cmdline.txt