I have a Dell latitude 6430u which has three tactile keys for mute/audio decrease/audio increase.On debian (sid), either with xfce or gnome, these keys don't work well. The mute key has never work. The two others work sometimes, but not well (I have to press twice, sometimes nothing happens, ...)Is it possible to have a better support for these keys? I don't know anything about drivers for tactile keys.When I use xev and using this shortcut I've got:FocusOut event, serial 37, synthetic NO, window 0x4c00001,    mode NotifyGrab, detail NotifyAncestorFocusIn event, serial 37, synthetic NO, window 0x4c00001,    mode NotifyUngrab, detail NotifyAncestorKeymapNotify event, serial 37, synthetic NO, window 0x0,    keys:  2   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0              0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   FocusOut event, serial 37, synthetic NO, window 0x4c00001,    mode NotifyGrab, detail NotifyAncestorFocusIn event, serial 37, synthetic NO, window 0x4c00001,    mode NotifyUngrab, detail NotifyAncestorKeymapNotify event, serial 37, synthetic NO, window 0x0,    keys:  2   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0              0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   
How can I install tactile audio keys on my latitude?
drivers;keyboard shortcuts