Below is the information for a PCI dual-port serial card I use: Manufacturer: Sealevel Systems INC. Name/Model: 7202 Dual Port RS-232 Interface Output of `lspci -vv`: 00:11.0 Serial controller: Sealevel Systems Inc Dual Port RS-232 Interface (rev 01) (prog-if 02 [16550]) Subsystem: Sealevel Systems Inc Dual Port RS-232 Interface 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 12 Region 0: Memory at e9100000 (32-bit, non-prefetchable) [size=128] Region 1: I/O ports at d800 [size=128] Region 2: I/O ports at dc00 [size=8] Region 3: I/O ports at e000 [size=8] Kernel driver in use: serial Lines from `dmesg`: [ 0.981647] serial 0000:00:11.0: found PCI INT A -> IRQ 12 [ 0.982022] serial 0000:00:11.0: 0000:00:11.0: Redundant entry in serial pci_table. Please send the output of lspci -vv, this message (0x135e,0x7202,0x135e,0x7202), the manufacturer and name of serial board or modem board to <linux-serial@xxxxxxxxxxxxxxx>. Thanks, Jonathan Chapman Glitch Works, LLC http://www.glitchwrks.com/