https://bugzilla.kernel.org/show_bug.cgi?id=18092
Summary: incorrect IRQ routing makes serial ports defunct
Product: ACPI
Version: 2.5
Kernel Version: 2.6.32.10
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Interrupts
AssignedTo: acpi_config-interru...@kernel-bugs.osdl.org
ReportedBy: jirisl...@gmail.com
Regression: No
Created an attachment (id=29312)
--> (https://bugzilla.kernel.org/attachment.cgi?id=29312)
dmesg without acpi=noirq
With this card:
00:09.0 Serial controller [0700]: NetMos Technology PCI 9835 Multi-I/O
Controller [9710:9835] (rev 01) (prog-if 02 [16550])
Subsystem: IBM Device [1014:0299]
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 10
Region 0: I/O ports at 1898 [size=8]
Region 1: I/O ports at 1890 [size=8]
Region 2: I/O ports at 1888 [size=8]
Region 3: I/O ports at 1880 [size=8]
Region 4: I/O ports at 1878 [size=8]
Region 5: I/O ports at 1850 [size=16]
Kernel driver in use: serial
Kernel modules: parport_serial
00: 10 97 35 98 03 01 80 02 01 02 00 07 08 40 00 00
10: 99 18 00 00 91 18 00 00 89 18 00 00 81 18 00 00
20: 79 18 00 00 51 18 00 00 00 00 00 00 14 10 99 02
30: 00 00 00 00 00 00 00 00 00 00 00 00 0a 01 00 00
40: 80 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00
The ttyS4/5 ports are not working when acpi irq routing is used.
There are several combinations:
1) acpi routing enabled (no kernel parameter) => ports 4+5 defunct.
ports 4+5+6+7 are all on irq 11
2) acpi routing disabled (acpi=noirq) => all ports working, 4+5 on irq
10, 6+7 on irq 11
3) with the quirk [1] and acpi routing enabled => all ports working,
ports 4+5 on irq 10, 6+7 on irq 11
4) in windows (ACPI enabled) => 4+5+6+7 are all on irq 9 and the ports are all
working.
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