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From: "Valerio Vanni" <valerio.vanni@inwind.it>
To: <linux-pm@vger.kernel.org>, <linux-serial@vger.kernel.org>,
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Cc: <gregkh@linuxfoundation.org>, <jslaby@suse.cz>, <baryluk@smp.if.uj.edu.pl>,
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Subject: Re: serial console does not wake from S3 suspend
Date: Fri, 30 May 2014 11:53:14 +0200
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> 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 3.14.4, 3.15-rc7 and today's next.

I hope someone is going to look at this bug.