> I can start X (in a chroot) via 'xinit -- :1'*, but my mouse and
> keyboard don't seem to work there (for example, I can't switch between
> ttys).

Update: My mouse works.

I installed 'dwm' and added the following to '~/.xinitrc':

exec /nix/store/bnhjxm7hrqbiykczg8hslgvw34l7jnh3-dwm-6.0/bin/dwm

Then I invoked 'xinit -- :1' and 'dwm' successfully started.  I wasn't
able to actually test it (I'm not sure how to fix the keyboard problem),
but I think that it's fine.