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[Bug 1313981] Re: Kernel disabling serial port ttyS0 on boot

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Brian Murray <brian@xxxxxxxxxx>
Date: Tue, 29 Apr 2014 03:15:58 -0000
Reply-to: Bug 1313981 <1313981@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Package changed: linux-lts-trusty (Ubuntu) => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1313981

Title:
  Kernel disabling serial port ttyS0 on boot

Status in “linux” package in Ubuntu:
  New

Bug description:
  On boot in 13.10 kern.log would state:

   Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
   00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

  and my serial modem would work just fine.

  After upgrading to 14.04 the kernel log contains:

   Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
   serial 00:0a: disabled

  How do I enable 00:0a?  Do I need to recompile the kernel with a
  different config?

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