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serial port no longer working after refresh

today i have refresh my debian etch system and now the serial port is no longer working i get no data from the port, maybe the problem is comming from the libc6 because this one was also updated.
when i boot with knoppix everything is working the hardware is ok.

kernel 2.6.18-6-686
libc6 2.3.6.dsl-13etch7

cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:16550A port:000003F8 irq:4 tx:0 rx:0
1: uart:unknown port:000002F8 irq:3
2: uart:unknown port:000003E8 irq:4
3: uart:unknown port:000002E8 irq:3

dmesg|grep 8250
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

PC= Toshiba T9000

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