Ubuntu

Bug #1087519
Comment #49

Comment 49 for bug 1087519

Revision history for this message

Roger Davis (rogerdavis-d) wrote on 2013-02-03:

#49

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 &n 0: 1: 8: 9: 12: 4 16: 200002 17: 0 18: 0 23: 126894 40: 0 42: 62850 43: 0 44: 0 45: 1 46: 0 47: 0 48: 0 49: 0 50: 0 51: 0 52: 0 53: 16594 54: 15 55: 466 56: 72300 NMI: 196 LOC: 257044 SPU: 0 PMI: 196 IWI: 0 RES: 405966 CAL: 706 TLB: 2826 TRM: 0 THR: 0 MCE: 0 MCP: 25 ERR: 0
MIS: 0 - WTH minicom open. 17 was NOT mentioned before I opened minicom, or after I closed minicom.
bsp; CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
66 0 0 0 0 0 0 0 IR-IO-APIC-edge timer
3 0 0 0 0 0 0 0 IR-IO-APIC-edge i8042
1 0 0 0 0 0 0 0 IR-IO-APIC-edge rtc0
0 0 0 0 0 0 0 0 IR-IO-APIC-fasteoi acpi
0 0 0 0 0 0 0 IR-IO-APIC-edge i8042
0 0 0 0 0 0 0 IR-IO-APIC-fasteoi ehci_hcd:usb1
0 0 0 0 0 0 0 IR-IO-APIC-fasteoi serial
0 0 0 0 0 0 0 IR-IO-APIC-fasteoi firewire_ohci
0 0 0 0 0 0 0 IR-IO-APIC-fasteoi ehci_hcd:usb2
0 0 0 0 0 0 0 DMAR_MSI-edge dmar0
0 0 0 0 0 0 0 IR-PCI-MSI-edge ahci
0 0 0 0 0 0 0 IR-PCI-MSI-edge ahci
0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
0 0 0 0 0 0 0 IR-PCI-MSI-edge xhci_hcd
0 0 0 0 0 0 0 IR-PCI-MSI-edge eth0
0 0 0 0 0 0 0 IR-PCI-MSI-edge mei
71 0 0 0 0 0 0 IR-PCI-MSI-edge snd_hda_intel
0 0 0 0 0 0 0 IR-PCI-MSI-edge fglrx[0]@PCI:1:0:0
123 94 109 25 22 26 34 Non-maskable interrupts
150281 182654 156581 38352 36071 54757 47418 Local timer interrupts
0 0 0 0 0 0 0 Spurious interrupts
123 94 109 25 22 26 34 Performance monitoring interrupts
0 0 0 0 0 0 0 IRQ work interrupts
392101 359264 421184 32128 34989 47522 47344 Rescheduling interrupts
1049 1166 1187 1172 1232 1144 1188 Function call interrupts
1937 2048 3408 1009 968 1656 1544 TLB shootdowns
0 0 0 0 0 0 0 Thermal event interrupts
0 0 0 0 0 0 0 Threshold APIC interrupts
0 0 0 0 0 0 0 Machine check exceptions
25 25 25 25 25 25 25 Machine check polls

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.

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.