Hi,
I had some trouble getting my raspberry pi 3b+ and the original 7" touchscreen up and running with volumio. I installed volumio v3.832 and the touchscreen plugin 3.5.1 (both were the most up to date versions available at that time. Everything worked fine, as long as my touchscreen did not go to sleep. It was impossible to wake it up, volumio was still reactive from a browser (and by ssh).
After reading many articles in this forum, I finally came to this thread: https://community.volumio.com/t/3-779-after-upgrade-raspberry-pi-touchscreen-display-does-not-work-any-more/69724/36
I then tried the following in my /boot/userconfig.txt file:
#dtoverlay=rpi-ft5406
dtoverlay=vc4-kms-v3d
dtoverlay=vc4-kms-dsi-7inch
And now everything runs as I expect it to. The screen goes to sleep and I can wake it with a single touch.
I don’t understand why, as I am not activating the touchscreen controller by leaving that command out, but it works. Thought I might share it with you, if someone else struggles with this.