I've installed Debian on a Sparc Ultra 10. It seems to work just fine,
except that the consoles tty[1..6] go black after a while. They all go
the same time and I can't seem to get them back without a reboot.

It happens after about ten minutes of idle time, so it seems that the
consoles go to sleep, but don't want to wake up any more.

Does anyone know how to fix this?

Regards, Miel.

Don't mail me at 2devnull, try my name at osgiliath in the Netherlands.