In the original user's xorg's log, in addition to what's listed for the new
test user:
* (WW) Falling back to old probe method for modesetting (and for fdev on the
line efter)
* (WW) Falling back to old probe method for vesa
* (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
* (EE)xf86OpenSerial: Cannot open device /dev/input/event2 Permission denied.
* right after: (II)opening input device '/dev/input/event2' failed
(Permission denied)
* right after: (II) failed to create input device '/dev/input/even2'
* (EE) libinput: Power Button: Failed to create a device for
/dev/input/event2
* (EE)Preinit returned 2 for "Power Button"
* (II) Unload module: libinput (to be continued, my hands hurt :p)