1 https://www.emacswiki.org/emacs/MetaKeyProblems
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4 If your Meta key works in the console, but Meta + Control + something doesn’t work, it may have to do with your .inputrc assuming the console sends 8-bit characters. Take a look at the dumpkeys man page and friends. You will find that for most Linux kernels, some combinations of keys and modifiers are defined, but not for all -- because the kernel will only take around 256 different events.
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6 emacs alt ctrl c-m does not work terminal
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8 http://cnswww.cns.cwru.edu/php/chet/readline/readline.html