You have been subscribed to a public bug:
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?
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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Kernel disabling serial port ttyS0 on boot
https://bugs.launchpad.net/bugs/1313981
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