I have a thinkpad t420, the volume keys have always previously worked straight out of the box. Just installed fedora 25 and none of those keys now work.
To fix it, manually assign the key commands. On the menu : Settings -> Keyboard -> Application Short Cuts. Use the Add option and press the corresponding keys when prompted.
up command : amixer set Master 5%+
down command : amixer set Master 5%-
mute command : amixer set Master toggle
still fedora 25 but this time a thinkpad x270
With the new keyboard, the top row now defaults to media keys and you have to press fn first to get f1,f2 etc. As any normal person would do... you change this back to normal in the bios so f1 is f1 and mute is fn+f1.
Now when you go into application short-cuts, it won't detect fn+f1 properly anymore. When you press fn it calls it "x86Wakeup" or something like that. What you really want to capture is XF86AudioMute, XF86AudioLowerVolume, XF86AudioRaiseVolume, XF86AudioMicMute. To do that, turn on fnlock i.e. fn-esc such that the fn light is on, then you can press f1 when it asks to capture a key and it'll capture mute properly etc. Now you should be able to map your keys again.
One glitch though, I can't capture the mic-mute button at all, I don't know why. I even tried to manually map the setting via "settings" -> "Settings editor" by adding the XF86AudioMicMute but it has no effect. It doesn't seem to send the fn-f4 button properly, I have no idea why.
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