Created attachment 62882 [details] Output of dmidecode on Ideapad S205 Function keys work fine except for the hardware on/off switch for wifi on Lenovo Ideapad S205. After booting with switch in position "on" wifi is disabled. Loading module ideapad-laptop doesn't help. There exists a workaround with module acer-wmi: One can load the module "acer_wmi". After toggling the hardware switch "rfkill list" shows "hard blocked: no" and one can use wifi. After that one can unload acer_wmi and with only ideapad_laptop loaded the wifi switch works as expected powering wifi on/off.
Created attachment 62932 [details] acpidump-lenovo-ideapad-s205.dat
Kernel mail loop discussion is here: http://comments.gmane.org/gmane.linux.drivers.platform.x86.devel/1820
Created attachment 67162 [details] 0001-acer-wmi-support-Lenovo-ideapad-S205-wifi-switch.patch This patch was sand to platform kernel mail for review, will go to v3.1 kernel.
A patch referencing this bug report has been merged in Linux v3.1-rc1: commit 15b956a0b5651bbb1217ec374fdd67291dabb2af Author: Lee, Chun-Yi <joeyli.kernel@gmail.com> Date: Sat Jul 30 17:00:45 2011 +0800 acer-wmi: support Lenovo ideapad S205 wifi switch