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You can put the mount -o,remount,rw in /etc/rc.local, above the last line of that file.

I screwed up: I gave a good answer to the wrong question. Sorry.
Meanwhile, on a raspberry, resolution and frambebuffers etc are manipulated through a file called config.txt, which lives in the...

Note: moved this answer from another question. One of my talents, it seems, is giving correct answers to wrong questions. Oh well.

I've got it sorted out.What happens is that the root volume is...

I've got it sorted out.What happens is that the root volume is mounted read only by reason of a kernel boot option.

I did some fiddling, and this will do the trick:

boot, login as root....