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Date: Mon, 26 Jan 2015 09:45:36 +0100
From: Matthias May <matthias.may@neratec.com>
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To: "Christopher M. Penalver" <christopher.m.penalver@gmail.com>,
	linux-wireless@vger.kernel.org
Subject: Re: Inquiry on sudo iw dev wlan1 set txpower fixed 14 -> command
 failed: Invalid argument (-22)
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On 26/01/15 03:00, Christopher M. Penalver wrote:
> Attempting to follow
> http://wireless.kernel.org/en/users/Documentation/iw#Setting_TX_power
> I get:
> sudo iw dev wlan1 set txpower fixed 14
> command failed: Invalid argument (-22)
>
>

iw dev <devname> set txpower <auto|fixed|limit> [<tx power in mBm>]

This is set in mBm and not in dBm.
Try sudo iw dev wlan1 set txpower fixed 1400.