I shut off the T1650 onboard serial port and the same error occurred. Dell T1650 Sealevel 7402 REV. D [ 1.217782] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [ 1.218020] serial 0000:03:02.0: 0000:03:02.0: Redundant entry in serial pci_table. Please send the output of lspci -vv, this message (0x135e,0x7402,0x135e,0x7402), the manufacturer and name of serial board or modem board to <linux-serial@xxxxxxxxxxxxxxx>. [ 1.238788] 0000:03:02.0: ttyS0 at I/O 0xd0b0 (irq = 18, base_baud = 115200) is a 16550A [ 1.259362] 0000:03:02.0: ttyS1 at I/O 0xd0a0 (irq = 18, base_baud = 115200) is a 16550A [ 1.279930] 0000:03:02.0: ttyS2 at I/O 0xd090 (irq = 18, base_baud = 115200) is a 16550A [ 1.300509] 0000:03:02.0: ttyS3 at I/O 0xd080 (irq = 18, base_baud = 115200) is a 16550A [ 1.300693] Linux agpgart interface v0.103 03:02.0 Serial controller: Sealevel Systems Inc Four Port RS-422/485 Interface (rev 01) (prog-if 02 [16550]) Subsystem: Sealevel Systems Inc Four Port RS-422/485 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 18 Region 0: Memory at f7c00000 (32-bit, non-prefetchable) [size=128] Region 1: I/O ports at d000 [size=128] Region 2: I/O ports at d0b0 [size=8] Region 3: I/O ports at d0a0 [size=8] Region 4: I/O ports at d090 [size=8] Region 5: I/O ports at d080 [size=8] Kernel driver in use: serial
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