Hi, I recently installed Debian Jessie on a ThinkPad W550s. It's a pretty standard installation, beginning with a fairly minimal package set, then adding Xfce and a bunch of other stuff, including some Gnome / GTK applications and a few things from backports. I'm currently running kernel 4.7.0-0.bpo.1-amd64 from backports.
Some of the function keys work (e.g., Fn-F5/F6 for brightness down/up), but some do not (e.g., F1-F3 for volume control, and F4 for suspend (suspend works fine out of the box via the Xfce suspend hooks)). Any idea how to fix / troubleshoot this? I saw this: http://www.thinkwiki.org/wiki/How_to_get_special_keys_to_work But the details are really not explained well - what are these masks, what do they mean, and where are they documented? I'm coming from a T61, where the function keys, at least all the ones I tried and needed, seemed to work fine, even out of the box, as far as I can recall. Celejar