BMC4312 power management

NoOp glgxg at
Thu Jun 17 00:32:49 UTC 2010

On 06/16/2010 10:43 AM, mchl2005 at wrote:
> 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:
> Priority: optional
> Section: restricted/admin
> Maintainer: Ubuntu Core Developers <ubuntu-devel-discuss at>
> 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.

Found this, but not sure it applies to your Ubuntu version as it refers
to Ubuntu 9.04 as the highest rev:
Note this:
+ Setting power level via 'iwconfig eth1 txpower X' now operational

Which would imply that it wasn't working before. So you might dig around
further to see if

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