@ReaperX7 Thanks for the url. Iím not sure the problem is the same, since myAtheros AR9485 device never worked. Iíve seen a few other identical cases on the web, all with Asus X200MA 11.6" ultrabook (fairly common these days at least in Europe) and Debian.
@RandomTroll Everything looked normal (lspci OK and ath9k module properly loaded after request_irq failed). I canít check it anymore though since the dual boot got washed up after I made a complete reinstall with net access using a working USB WiFi key. After that the Debian installer identified my other OS (Windows 8.1) as 2 Vista instances and I ran into terrible UEFI/grub issues (GRUB: ďinvalid arch independent ELF magicĒ). I downloaded the live CD image to try to fix it along the lines of http://askubuntu.com/questions/72003...lf-magic-error
and well such a drag just to get my keyboard layout, and grub-install command not found, etc, etc.. Iíve not been able to boot into the installed Debian 7.6 using the live/install CD/flashdrive like it once was possible.
Iíve been dual booting Windows/Linux for 15 years (I must still use a couple of Windows only apps for my job) but now with UEFI itís getting too much of a hassle, I just have no time for that game. I might end up using the new laptop for Windows and the old one for Linux, though such an arrangement is not ideally convenient.
Cheers, and thanks again for your help,