[ltp] Re: wireless switch: is off really off?
Tue, 10 Jun 2008 23:04:36 -0400
Arno Trautmann wrote:
> until a few days ago, I didn’t manage to get my W-LAN running, so I
> always disabled it by turning the swith to ”off“. But the machine was
> very warm underneath the fingerprint-reader. (a X61s)
> Then I finally managed to get W-LAN, and found this on thinkwiki:
> If you need Wi-Fi, you can also reduce power consumption (at the price
> of performances) by activating the power saving modes:
> iwpriv eth1 set_power 5
> For drivers using the new Wi-Fi kernel framework (mac80211/cfg80211),
> the canonical way to do this is now:
> for i in /sys/bus/pci/devices/*/power_level ; do echo 5 > $i ; done
> Using this, the machine is much cooler, /with/ W-LAN enabled and active.
> So what caused the heating? Was it the w-lan card anyhow /not/ disabled
> by the switch? Or does the last code line change anything else than w-lan?
> I’m very happy now, having temperatures of about 40°C instead of nearly
> 50°C—but I would like to understand, why…
I've found that the switch only turns off the radio...