In LibreELEC 7, LCDProc is built in, and should include dm140
Well that's the issue, the dm140 section in the config file is empty!
I haven't dug deeper in the filesystem to check if the driver files are there but I could do that if I had some guidance.
The bottom line is that my LCD is not displaying anything and it is detected correctly (as I have checked with dmesg).
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This is what the LCDd.conf file has for DM140:
It's EMPTY!