cartão serial MosChip 9865

Question

Acabei de comprar um novo cartão de porta serial, mas não consegui fazê-lo funcionar, ele aparece no lspci e no dmesg, mas quando envio dados por ele, não o recebo de volta na outra porta (eu m conectando ambas as portas junto com um cabo DB-9).

dmesg | grep tty:

[    0.000000] console [tty0] enabled
[    0.810197] 00:04: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    0.831771] 0000:04:07.0: ttyS1 at I/O 0xc130 (irq = 21, base_baud = 115200) is a ST16650V2
[    0.853172] 0000:04:07.1: ttyS2 at I/O 0xc120 (irq = 22, base_baud = 115200) is a ST16650V2
[    0.860203] tty ttyS1: hash matches

lspci -v:

04:07.0 Serial controller: MosChip Semiconductor Technology Ltd. PCI 9865 Multi-I/O Controller (prog-if 02 [16550])
    Subsystem: Device a000:1000
    Flags: medium devsel, IRQ 21, NUMA node 0
    I/O ports at c130 [size=8]
    Memory at fe105000 (32-bit, non-prefetchable) [size=4K]
    Memory at fe104000 (32-bit, non-prefetchable) [size=4K]
    Capabilities: <access denied>
    Kernel driver in use: serial
    Kernel modules: parport_pc

04:07.1 Serial controller: MosChip Semiconductor Technology Ltd. PCI 9865 Multi-I/O Controller (prog-if 02 [16550])
    Subsystem: Device a000:1000
    Flags: medium devsel, IRQ 22, NUMA node 0
    I/O ports at c120 [size=8]
    Memory at fe103000 (32-bit, non-prefetchable) [size=4K]
    Memory at fe102000 (32-bit, non-prefetchable) [size=4K]
    Capabilities: <access denied>
    Kernel driver in use: serial
    Kernel modules: parport_pc

04:07.2 Parallel controller: Illegal Vendor ID Device 9865 (prog-if 03 [IEEE1284])
    Subsystem: Device a000:2000
    Flags: medium devsel, IRQ 10, NUMA node 0
    I/O ports at c110 [disabled] [size=8]
    I/O ports at c100 [disabled] [size=8]
    Memory at fe101000 (32-bit, non-prefetchable) [disabled] [size=4K]
    Memory at fe100000 (32-bit, non-prefetchable) [disabled] [size=4K]
    Capabilities: <access denied>

Nota: Estou executando o Parabola GNU / Linux-libre 64 bits