http://bugzilla.kernel.org/show_bug.cgi?id=8562
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------- Comment #19 from [EMAIL PROTECTED] 2007-08-07 11:29 -------
This might be a bug in the ACPI description of your COM4 (ttyS3) device.
Your dmesg has this:
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
serial8250: ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A
serial8250: ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A
00:06: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:07: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
00:08: ttyS2 at I/O 0x3e8 (irq = 10) is a 16550A
00:09: ttyS3 at I/O 0x2e8 (irq = 11) is a 16550A
The duplicate lines (starting with "00:06") are from the 8250 PNP probes.
According to them, ACPI told us that ttyS2 is on IRQ 10 and ttyS3 is on IRQ 11.
Without those probes (as in 2.4.30 and possibly when you turn off ACPI in
the BIOS), we use the compiled-in defaults of IRQ 4 and 3 for ttyS2 and ttyS3.
I don't know exactly what the problem symptom is. Does the problem go away
if you force the IRQ back to 3 with "setserial /dev/ttyS3 irq 3"?
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