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IRQ-Sharing Kubuntu 12.04

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Hallo allerseits,
ich versuche eine serielle 4-Port-Karte zum Laufen zu bringen.

Kann es sein, daß das IRQ-Sharing nicht funktioniert?

lspci -vv
Code:

Code02:01.0 Serial controller: MosChip Semiconductor Technology Ltd. PCI 9845 Multi-I/O Controller (rev 01) (prog-if 02 [16550])
        Subsystem: LSI Logic / Symbios Logic 0P4S (4 port 16550A serial card)
        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Interrupt: pin A routed to IRQ 22
        Region 0: I/O ports at df08 [size=8]
        Region 1: I/O ports at df10 [size=8]
        Region 2: I/O ports at df18 [size=8]
        Region 3: I/O ports at df20 [size=8]
        Region 4: I/O ports at df28 [size=8]
        Region 5: I/O ports at df30 [size=16]
        Kernel driver in use: serial
        Kernel modules: parport_serial

Code:

serial /proc/ioports
03f8-03ff : serial
    df08-df0f : serial
    df10-df17 : serial
    df18-df1f : serial
    df20-df27 : serial

Code:

dmesg |grep serial
[    0.483862] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    0.640599] serial 0000:02:01.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22

Code:

setserial -g /dev/ttyS?
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
/dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3
/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3
/dev/ttyS4, UART: 16550A, Port: 0xdf08, IRQ: 22
Cannot get serial info: Input/output error
Cannot get serial info: Input/output error
Cannot get serial info: Input/output error
/dev/ttyS8, UART: unknown, Port: 0x0000, IRQ: 0
/dev/ttyS9, UART: unknown, Port: 0x0000, IRQ: 0

Manchmal erscheint auch /dev/ttyS5. Wenn ich dann versuche /dev/ttyS6 und /dev/ttyS7 einzurichten, verschwindet /dev/ttyS5. Aber meistens erschein bei
Code:

setserial -g /dev/ttyS?
nur die obige Anzeige.

Ich hoffe, Ihr könnt mir helfen.

Danke!

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