It’s not caused by input method.

All version works ok in daemon started with `/usr/bin/emacs —daemon` or `/usr/bin/emacs —fg-daemon` in terminal.
(pgtk or without pgtk)

And the version without pgtk works ok by systemd user unit.
But the pgtk version can’t work by systemd unit.
The pgtk version thought it’s in a terminal and refused 'C-;’ only by daemon started over systemd. 
(I started X11 by startx command in tty)




Sent with a Spark
在 2021年12月20日 +0800 21:20，Yuuki Harano <masm+emacs@masm11.me>，写道：
Thanks for cc'ing me.

On Mon, 20 Dec 2021 11:28:46 +0800,
Po Lu <luangruo@yahoo.com> wrote:
GTK likes to swallow keyboard modifiers at random, especially things
like C-;.

Perhaps Yuuki might have some ideas.

Maybe gtk consumes C-; and emits ;.
I have no idea.

Try:
(pgtk-use-im-context nil)

This disables input methods. If you need a input method,
try elisp-based input methods.

--
Yuuki Harano