Dell Latitude 5400 Chrome (google/sarien): GNU/Linux: Super key not working and caps lock acts as super key

[paulmenzel]

[Split out from issue https://github.com/MrChromebox/firmware/issues/318.]

Installing RW_LEGACY (TianoCore) using the Chrome OS Firmware Utility script worked fine.

In Ubuntu 21.10 or Debian sid/unstable, the super key (globe icon) does not work, and the caps lock key seems to be mapped to the super key.

[paulmenzel]

When pressing key X, Linux logs:

Super key:

[  371.749464] atkbd serio0: Unknown key pressed (translated set 2, code 0xd4 on isa0060/serio0).
[  371.749472] atkbd serio0: Use 'setkeycodes e054 <keycode>' to make it known.
[  371.848416] atkbd serio0: Unknown key released (translated set 2, code 0xd4 on isa0060/serio0).
[  371.848430] atkbd serio0: Use 'setkeycodes e054 <keycode>' to make it known.

Rectangle function key (F3):

[  392.224626] atkbd serio0: Unknown key pressed (translated set 2, code 0xd5 on isa0060/serio0).
[  392.224642] atkbd serio0: Use 'setkeycodes e055 <keycode>' to make it known.
[  392.366896] atkbd serio0: Unknown key released (translated set 2, code 0xd5 on isa0060/serio0).
[  392.366910] atkbd serio0: Use 'setkeycodes e055 <keycode>' to make it known.

Overview function key (F4):

[  426.163166] atkbd serio0: Unknown key pressed (translated set 2, code 0xd6 on isa0060/serio0).
[  426.163183] atkbd serio0: Use 'setkeycodes e056 <keycode>' to make it known.
[  426.246926] atkbd serio0: Unknown key released (translated set 2, code 0xd6 on isa0060/serio0).
[  426.246942] atkbd serio0: Use 'setkeycodes e056 <keycode>' to make it known.

[paulmenzel]

libinput debug-events detects the “Caps Lock” key as KEY_LEFTMETA (125).

[coolstar]

Not a coreboot issue. Key mappings are controlled by Wilco EC which is closed source