From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Valerio Vanni" <valerio@valeriovanni.com>
Subject: Re: serial console does not wake from S3 suspend
Date: Thu, 3 Apr 2014 13:47:43 +0200
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"Valerio Vanni" <valerio@valeriovanni.com> ha scritto nel messaggio
news:lg9etc$9fl$1@ger.gmane.org
> When resuming from S3 suspend, serial console starts sending garbage
> on the serial port.
> Not continuously, it sends garbage only when in local console prints a
> text.
> It stops only when the (sending) machine is shut down, or if some
> text is sent manually (i.e. with "cat txtfile > /dev/ttyS0").
>
> Full details are here:
> https://bugzilla.kernel.org/show_bug.cgi?id=69751

The problem is still present in final 3.14 (and in linux-next).