I am in the process of getting rid of udev daemon from my system. I have fixed all issues, only one small problem is remaining:It used to be (when I was using udev), that Fn+Down acted as XF86MonBrightnessDown and Fn+UP acted as XF86MonBrightnessUp, so that I could create a keybinding in Openbox for xbacklight -dec 5 and xbacklight -inc 5 respectively to change display brightness.When I boot my laptop without udev, these keys no longer work. Other Fn keys such as Fn+Pause or Fn+SysRq work fine.Looking with xev, I see following when I press Fn+Down, KeyPress event, serial 46, synthetic NO, window 0x2600001,    root 0xb9, subw 0x0, time 952589, (169,-10), root:(1040,435),    state 0x10, keycode 101 (keysym 0x0, NoSymbol), same_screen YES,    XLookupString gives 0 bytes:     XmbLookupString gives 0 bytes:     XFilterEvent returns: FalseKeyRelease event, serial 46, synthetic NO, window 0x2600001,    root 0xb9, subw 0x0, time 952589, (169,-10), root:(1040,435),    state 0x10, keycode 101 (keysym 0x0, NoSymbol), same_screen YES,    XLookupString gives 0 bytes:     XFilterEvent returns: FalseHow can I make my Fn keys work again ?I am using LXDE (Openbox) on Debian.UPDATEI have discovered a file /lib/udev/keymaps/dell which apparently idev uses to set up the keymap. It contains, among other lines:0x85 brightnessdown # Fn+Down arrow Brightness Down0x86 brightnessup # Fn+Up arrow Brightness Upso how can I map this file manually, without udev?What command do I need to use?
Fn keyboard keys not working (when udev is disabled)
keyboard;udev;keyboard layout
Maybe I overlook something, but isn't this just a matter of adding the XF86MonBrightnessDown and XF86MonBrightnessUp to your xmodmap?xmodmap -e keycode 101 = XF86MonBrightnessDown NoSymbol XF86MonBrightnessDown for testing this temporarily. Similar for brightness up.If it works, you need to make this permanent depending on your display manager. LXDE has LXDM, so make your changes according to here (xmodmap handling starts at line 39) after you modify a keymap generated with xmodmap -pke > ~/.Xmodmap permanently as tested with the xmodmap modification above.