Hi, I also have a Thinkpad X40 laptop with all wireless features (wifi and bluetooth). The Fn-F5 only turns on the bluetooth feature (that does not working in Solaris yet, no bluetooth stack), but not the wireless card. The wireless light activity only turns on when you are plumbing the wireless interface (ipw0 is my wireless card), only in this case. When the interface is turned off, the light dissapears.
You cannot enable/disable wireless card via Fn-F5 button in the laptop, tested with SXDE 65 and SXCE b70. You should use dladm in order to use wireless connection, wificonfig is the old method (imho is deprecated). One thing more, the wireless card is not in PCMCIA bus, is MiniPCI and its standard (but IBM manufacturated, other cards doesnot work, such a Atheros without IBM logo) Cheers! This message posted from opensolaris.org
