profile.sh: revert 97afbbf0 for reasons given in comments.

src/profile.sh

@@ -1,5 +1,8 @@
-if [[ "$(tty)" == '/dev/tty'* ]]; then
+# To avoid potential situation where cdm(1) crashes on every TTY, here we
+# default to execute cdm(1) on tty1 only, and leave other TTYs untouched.
+if [[ "$(tty)" == '/dev/tty1' ]]; then
     [[ -n "$CDM_SPAWN" ]] && return
-    [[ -z "$DISPLAY$SSH_TTY" ]] && exec cdm
+    # Avoid executing cdm(1) when X11 has already been started.
+    [[ -z "$DISPLAY$SSH_TTY$(pgrep xinit)" ]] && exec cdm
 fi