[Bug 1571500] Re: serial-getty at .service does not configure baud rate

[Phillip Susi]

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On 04/24/2016 04:15 AM, Martin Pitt wrote:
> My understanding is that this unit isn't meant to configure baud
> rates but merely start getty on the requested one. In a world
> before systemd there was nothing that changed them by default
> either. Normally you set the baud rate on the kernel command line 
> (https://www.kernel.org/doc/Documentation/kernel-parameters.txt)
> or just rely on the kernel driver's default.

I'd say that at least a comment in that script is in order to let
people reading it know that this setting has no effect unless they
change the switch, or that they should use another, preferred
mechanism for setting the baud rate instead.


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https://bugs.launchpad.net/bugs/1571500

Title:
  serial-getty at .service does not configure baud rate

Status in systemd package in Ubuntu:
  Invalid

Bug description:
  I want to add a console port on a Ubuntu machine to be able to access
  it from a terminal server.

  This machine has no serial port but lots of USB ports (like most nowadays).
  I use a USB-to-serial adapter to have the ttyUSB0 up and listening.

  I copied /lib/systemd/system/serial-getty at .service to
  /lib/systemd/system/serial-getty at ttyUSB0.service and set the speed to
  57600

  +++++++++++
  [Service]
  ExecStart=-/sbin/agetty --keep-baud 57600 %I $TERM
  +++++++++++

  the service status shows the right speed

  +++++++++++
  $ sudo systemctl status serial-getty at ttyUSB0.service
  ● serial-getty at ttyUSB0.service - Serial Getty on ttyUSB0
     Loaded: loaded (/lib/systemd/system/serial-getty at ttyUSB0.service; enabled; vendor preset: enabled)
     Active: active (running) since 月 2016-04-18 14:07:30 JST; 58min ago
       Docs: man:agetty(8)
             man:systemd-getty-generator(8)
             http://0pointer.de/blog/projects/serial-console.html
   Main PID: 3017 (agetty)
     CGroup: /system.slice/system-serial\x2dgetty.slice/serial-getty at ttyUSB0.service
             └─3017 /sbin/agetty --keep-baud 57600 ttyUSB0 vt220
  +++++++++++

  Even so, I can't log in from the serial port at a speed other than
  9600...

  With such settings I shouldn't even be able to get a right answer at
  9600bps, only garbage.

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