Hi,
I updated from LE 9.2.8 to 10.0.2 on my RPI3B.
I use monitor (max res. 1280x1024) for standard work and projector (1080p) for movies watching. After install I had common problem with black screen, fixed by editing cmdline.txt with video= HDMI-A-1:1280x1024@60HzD at the end.
On 9.2.8 I had modified guisettings.xml :
<setting id="videoscreen.whitelist">0192001080060.00000pstd,0128001024060.00000pstd</setting>
so I could switch resolution depending on output demand. Worked perfectly until LE 10.0.2.
Only thing that works for me is to edit cmdline and restart RPi.
Everything I need, is to have 2 resolutions defined manualy and option to switch between them in Kodi.
Do you know some simple workaround?