BMC4312 power management

[mchl2005 at gmail.com]

I've been looking into this lately and can't seem to find anything useful.
When running 'sudo iwlist eth1 txpower', I get the following:
eth1      2 available transmit-powers :
      0 dBm      (1 mW)
      25 dBm      (255 mW)
          Current Tx-Power:32 dBm      (1496 mW)

There seems to be way to change it, for example:
sudo iwconfig eth1 txpower 25
Error for wireless request "Set Tx Power" (8B26) :
    SET failed on device eth1 ; Operation not supported.

... and every other value I tried resulted in the same error message.
The driver in use is 'wl', provided by bcmwl-kernel-source.

Package: bcmwl-kernel-source
State: installed
Automatically installed: no
Version: 5.10.91.9+bdcom-0ubuntu4
Priority: optional
Section: restricted/admin
Maintainer: Ubuntu Core Developers <ubuntu-devel-discuss at lists.ubuntu.com>
Uncompressed Size: 1,835k
Depends: dkms, linux-libc-dev, libc6-dev, linux-headers-generic
Description: Broadcom 802.11 Linux STA wireless driver source
 These package contains Broadcom 802.11 Linux STA wireless driver for use
with Broadcom's BCM4311-, BCM4312-, BCM4321-, and BCM4322-based
 hardware.
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