If you ‘apk add alpine-desktop && slim’ you will most likely lose ability to use your keyboard.
The same thing happens if you ‘apk add xorg-server && X -configure && X -config /root/xorg.conf.new’

Workaround for this is to do this before starting ‘xorg-server’ (or ‘slim’):

X -configure 
echo 'Section "ServerFlags"' >> /root/xorg.conf.new
echo 'Option "AllowEmptyInput" "off"' >> /root/xorg.conf.new
echo 'EndSection' >> /root/xorg.conf.new
mv /root/xorg.conf.new /etc/X11/xorg.conf

(from redmine: issue id 478, created on 2010-11-19, closed on 2013-05-21)