That makes sense. The commit doesn't revert cleanly but before finding the
option I just reverted the default:
diff --git a/grub-core/term/serial.c b/grub-core/term/serial.c
index 8260dcb7a..72a6927b4 100644
--- a/grub-core/term/serial.c
+++ b/grub-core/term/serial.c
@@ -271,7 +271,7 @@ grub_cmd_serial (grub_extcmd_context_t ctxt, int argc,
char **args)
name = args[0];
if (!name)
- name = "auto";
+ name = "com0";
port = grub_serial_find (name);
if (!port)
I think (but please double check me on this), that it should be possible to
opt-in to the new behaviour by just setting serial=auto in grub.cfg.
/Morten
