less, TTY and fbcon

[cova]

Hi all,
I'm facing an issue that I can't really make head or tail of. I've installed several gentoo laptops but this is a novelty
what happens is that "less" is not working properly. Basically, each time i use less to read a file, every keystroke that i enter (no matter if I'm connected with ssh or konsole) is garbled or better, only half of keystrokes reach less.
It seems that tty is shared among two processes (and I wonder why less uses tty at all).
If I use local vt (alt+F1), without X active on the machine, and at the same time I log into the same box with ssh I end in the situation where one keystroke on local keryboard is sent to local vt and the second stroke is sent on ssh (i can see it on remote end).
The only peculiar thing of the machine is that it make use of fbcon (radeon). I tried every combination of kernel parameters (like console=tty1, etc..) and fbcon=map:X and so on, with no help.
other utilities that doesn't uses tty works without problems (like mc).

Interesting enough, even ssh shows some hiccups: every time I enter the machine with ssh I get this:

sshd[5278]: error: Failed to disconnect from controlling tty.

Maybe the solution is trivial, but I can't sort it out

the system is a ~ amd64 with kernel 3.2.13 and packages up-to date as 29/03/12

I'm using fbcon with radeon KMS driver (that works just fine with X).

Can someone give me at least a pointer in the right direction? many thanks for any answer.

[dE_logics]

Maybe something's wrong with inittab?
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[cova]