I'll do a little investigation of this. I know that the screensaver process is what's
causing the troubles. You can verify this manually using apm, the backlight will go
out on a "standby", then will come right back on with the screensaver running.
Are you logged in as root? Prior to RedHat 6.2, the root user could run screensavers
and "lock" the console. This was removed in the later versions since doing this was
considered to be a security risk. Try setting up as a regular (non-root) user and see
if the screensavers work.
sod ( "The lunatics are on the grass..." )