cooking livecd (whether or not upgraded, with or without additional packages):
consoles give only blank screen; also:
root@slitaz:~# deallocvt 2
VT_DISALLOCATE: Device or resource busy
deallocvt: could not deallocate console 2
also, booting with, e.g.
slitaz screen=1280x768x24
did nothing with basic cooking (yet to try upgrades; will shortly.)