OK, I understand that items altered in Grub at boot time are temporary.
But it is confusing to me why the suggested change to the file
(permanent) is different ( "pci=nocrs" and
"GRUB_CMDLINE_LINUX="8250.nr_uarts=5 pci=nocrs" ). Do they actually
have the same result? The "pci=nocrs" is without the uarts=5...
My motherboard is fairly new design, I think. Here is some info from LSHW :
roger-desktop
description: Desktop Computer
product: (To be filled by O.E.M.)
width: 64 bits
capabilities: smbios-2.7 dmi-2.7 vsyscall32
configuration: boot=normal chassis=desktop family=To be filled by O.E.M.
sku=To be filled by O.E.M. uuid=876A4EBE-6FBD-11E1-BD11-0011118582DC
*-core
description: Motherboard
product: DZ77BH-55K
vendor: Intel Corporation
physical id: 0
version: AAG39008-400
serial: BQBH210000JM
*-firmware
description: BIOS
vendor: Intel Corp.
physical id: 0
version: BHZ7710H.86A.0057.2012.0208.1904
date: 02/08/2012
size: 64KiB
capacity: 6336KiB
capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd
int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard
int14serial int17printer acpi usb biosbootspecification
*-cpu
description: CPU
product: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
*-pci
description: Host bridge
product: Ivy Bridge DRAM Controller
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 09
width: 32 bits
clock: 33MHz
*-pci
description: PCI bridge
product: Integrated Technology Express, Inc.
vendor: Integrated Technology Express, Inc.
physical id: 0
bus info: pci@0000:03:00.0
version: 30
width: 32 bits
clock: 33MHz
capabilities: pci pm subtractive_decode bus_master cap_list
resources: ioport:d000(size=4096) memory:f7d00000-f7dfffff
*-communication
description: Serial controller
<-------
product: 56K FaxModem Model 5610
vendor: 3Com Corp, Modem Division
physical id: 1
bus info: pci@0000:04:01.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: pm 16550 cap_list
configuration: driver=serial latency=0
resources: irq:17 ioport:d000(size=8)
<-------
*-serial UNCLAIMED
<------- ???
description: SMBus
product: Panther Point SMBus Controller
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 04
width: 64 bits
clock: 33MHz
configuration: latency=0
resources: memory:f7f35000-f7f350ff ioport:f000(size=32)
>From DMESG :
[ 1.244883] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
[ 1.380227] serial 0000:04:01.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 1.401196] 0000:04:01.0: ttyS4 at I/O 0xd000 (irq = 17) is a 16550A
[ 13.742194] snd_hda_intel 0000:01:00.1: PCI INT B -> GSI 17 (level, low) ->
IRQ 17
also
[ 1.072912] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 10 *11 12 14 15)
significant that no 17 listed in this or similar lines?
/proc/interrupts - WTH minicom open. 17 was NOT mentioned before I opened
minicom, or after I closed minicom.
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5
CPU6 CPU7
0: 66 0 0 0 0 0
0 0 IR-IO-APIC-edge timer
1: 3 0 0 0 0 0
0 0 IR-IO-APIC-edge i8042
8: 1 0 0 0 0 0
0 0 IR-IO-APIC-edge rtc0
9: 0 0 0 0 0 0
0 0 IR-IO-APIC-fasteoi acpi
12: 4 0 0 0 0 0
0 0 IR-IO-APIC-edge i8042
16: 200002 0 0 0 0 0
0 0 IR-IO-APIC-fasteoi ehci_hcd:usb1
17: 0 0 0 0 0 0
0 0 IR-IO-APIC-fasteoi serial
18: 0 0 0 0 0 0
0 0 IR-IO-APIC-fasteoi firewire_ohci
23: 126894 0 0 0 0 0
0 0 IR-IO-APIC-fasteoi ehci_hcd:usb2
40: 0 0 0 0 0 0
0 0 DMAR_MSI-edge dmar0
42: 62850 0 0 0 0 0
0 0 IR-PCI-MSI-edge ahci
43: 0 0 0 0 0 0
0 0 IR-PCI-MSI-edge ahci
44: 0 0 0 0 0 0
0 0 IR-PCI-MSI-edge xhci_hcd
45: 1 0 0 0 0 0
0 0 IR-PCI-MSI-edge xhci_hcd
46: 0 0 0 0 0 0
0 0 IR-PCI-MSI-edge xhci_hcd
47: 0 0 0 0 0 0
0 0 IR-PCI-MSI-edge xhci_hcd
48: 0 0 0 0 0 0
0 0 IR-PCI-MSI-edge xhci_hcd
49: 0 0 0 0 0 0
0 0 IR-PCI-MSI-edge xhci_hcd
50: 0 0 0 0 0 0
0 0 IR-PCI-MSI-edge xhci_hcd
51: 0 0 0 0 0 0
0 0 IR-PCI-MSI-edge xhci_hcd
52: 0 0 0 0 0 0
0 0 IR-PCI-MSI-edge xhci_hcd
53: 16594 0 0 0 0 0
0 0 IR-PCI-MSI-edge eth0
54: 15 0 0 0 0 0
0 0 IR-PCI-MSI-edge mei
55: 466 71 0 0 0 0
0 0 IR-PCI-MSI-edge snd_hda_intel
56: 72300 0 0 0 0 0
0 0 IR-PCI-MSI-edge fglrx[0]@PCI:1:0:0
NMI: 196 123 94 109 25 22
26 34 Non-maskable interrupts
LOC: 257044 150281 182654 156581 38352 36071
54757 47418 Local timer interrupts
SPU: 0 0 0 0 0 0
0 0 Spurious interrupts
PMI: 196 123 94 109 25 22
26 34 Performance monitoring interrupts
IWI: 0 0 0 0 0 0
0 0 IRQ work interrupts
RES: 405966 392101 359264 421184 32128 34989
47522 47344 Rescheduling interrupts
CAL: 706 1049 1166 1187 1172 1232
1144 1188 Function call interrupts
TLB: 2826 1937 2048 3408 1009 968
1656 1544 TLB shootdowns
TRM: 0 0 0 0 0 0
0 0 Thermal event interrupts
THR: 0 0 0 0 0 0
0 0 Threshold APIC interrupts
MCE: 0 0 0 0 0 0
0 0 Machine check exceptions
MCP: 25 25 25 25 25 25
25 25 Machine check polls
ERR: 0
MIS: 0
All this is part of a big learning curve for me. Help in interpreting
it is greatly appreciated.
I haven't yet tried "GRUB_CMDLINE_LINUX="8250.nr_uarts=5 pci=nocrs" in
/etc/default/grub, for fear that I may make the machine unbootable.
I haven't yet tried "irqpoll", because the above line seems by my guess
to be a better bet, but I don't want to wreck things. Also, is it just
a boot that it will be slower? Much slower?
>From your last paragraph, I have tried calling the modem from another
line. It will try to answer, but I don't have another modem to try to
connect with. How should I look to see if see kernel complains about
"nobody cares" on the terminal? If you mean in something like minicom,
there are no result codes or anything else shown - just nothing.
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https://bugs.launchpad.net/bugs/1087519
Title:
Serial port ttyS4 doesn't work in 12.04
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