Disappearing IRQ 17 !?! ----------------------------------------- Here it is: roger@roger-desktop:~$ sudo dmesg|grep tty [sudo] password for roger: [ 0.000000] console [tty0] enabled [ 1.457141] 0000:04:01.0: ttyS4 at I/O 0xd000 (irq = 17) is a 16550A [ 1.660953] tty tty33: hash matches roger@roger-desktop:~$ ------------------------------------------------------ Here is isn't roger@roger-desktop:~$ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 0: 126 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: 200001 0 0 0 0 0 0 0 IR-IO-APIC-fasteoi ehci_hcd:usb1 18: 0 0 0 0 0 0 0 0 IR-IO-APIC-fasteoi firewire_ohci 23: 365444 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: 285646 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 ... ------------------------------------------------------ Back again! from sudo lshw *-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) -------------------------------------------------------------------------- POOF - gone again!!! roger@roger-desktop:~$ lsdev Device DMA IRQ I/O Ports ------------------------------------------------ 0000:00:19.0 f040-f05f 0000:00:1f.2 f020-f03f f060-f063 f070-f077 f080-f083 f090-f097 0000:00:1f.3 f000-f01f 0000:01:00.0 e000-e0ff 0000:04:01.0 d000-d007 0000:06:00.0 c000-c00f c010-c013 c020-c027 c030-c033 c040-c047 acpi 9 ACPI 0400-0403 0404-0405 0408-040b 0410-0415 0420-042f 0450-0450 ahci 42 43 c000-c00f c010-c013 c020-c027 c030-c033 c040-c047 f020-f03f f060-f063 f070-f077 f080-f083 f090-f097 cascade 4 dma 0080-008f dma1 0000-001f dma2 00c0-00df dmar0 40 ehci_hcd:usb1 16 ehci_hcd:usb2 23 eth0 53 fglrx[0]@PCI:1:0:0 56 firewire_ohci 18 fpu 00f0-00ff i8042 1 12 keyboard 0060-0060 0064-0064 mei 54 PCI 0000-0cf7 0cf8-0cff 0d00-ffff 2000-2fff c000-cfff d000-dfff d000-dfff e000-efff pic1 0020-0021 pic2 00a0-00a1 pnp 0200-020f 0400-0453 0454-0457 0458-047f 04d0-04d1 0500-057f 0680-069f 0a00-0a0f 164e-164f ffff-ffff ffff-ffff rtc0 8 0070-0077 serial d000-d007 snd_hda_intel 55 timer 0 timer0 0040-0043 timer1 0050-0053 vesafb 03c0-03df w83627ehf 0a05-0a06 0a05-0a06 xhci_hcd 44 45 46 47 48 49 50 51 52 roger@roger-desktop:~$ ----------------------------------------------------------------------------- Still missing... roger@roger-desktop:~$ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 0: 128 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: 200001 0 0 0 0 0 0 0 IR-IO-APIC-fasteoi ehci_hcd:usb1 18: 0 0 0 0 0 0 0 0 IR-IO-APIC-fasteoi firewire_ohci 23: 380894 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: 286967 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: 387086 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: 457 71 0 0 0 0 0 0 IR-PCI-MSI-edge snd_hda_intel 56: 1490942 0 0 0 0 0 0 0 IR-PCI-MSI-edge fglrx[0]@PCI:1:0:0 NMI: 147 141 118 121 23 24 24 25 Non-maskable interrupts LOC: 3071820 3143660 3146276 3063127 1902366 2065757 2406740 1542871 Local timer interrupts SPU: 0 0 0 0 0 0 0 0 Spurious interrupts PMI: 147 141 118 121 23 24 24 25 Performance monitoring interrupts IWI: 0 0 0 0 0 0 0 0 IRQ work interrupts RES: 3622679 3643198 3349856 3556317 1486992 1663527 1940060 1052250 Rescheduling interrupts CAL: 107783 186310 216456 187773 289026 257368 341266 185841 Function call interrupts TLB: 48657 99818 82465 84859 7023 7860 9827 8494 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: 87 87 87 87 87 87 87 87 Machine check polls --------------------------------------------------------------------------------------------------------------------------- Gone forever? roger@roger-desktop:~$ procinfo Memory: Total Used Free Buffers RAM: 16401300 2721500 13679800 116388 Swap: 16741372 0 16741372 Bootup: Thu Apr 11 17:19:06 2013 Load average: 0.11 0.18 0.22 2/404 6286 user : 00:43:26.51 1.3% page in : 3409720 nice : 00:00:01.67 0.0% page out: 3914015 system: 00:26:16.73 0.8% page act: 247041 IOwait: 00:08:40.23 0.3% page dea: 0 hw irq: 00:00:00.01 0.0% page flt: 38258155 sw irq: 00:00:04.83 0.0% swap in : 0 idle : 2d 07:43:19.14 97.7% swap out: 0 uptime: 07:09:03.96 context : 61303833 irq 0: 128 timer irq 45: 1 xhci_hcd irq 1: 3 i8042 irq 46: 0 xhci_hcd irq 8: 1 rtc0 irq 47: 0 xhci_hcd irq 9: 0 acpi irq 48: 0 xhci_hcd irq 12: 4 i8042 irq 49: 0 xhci_hcd irq 16: 200001 ehci_hcd:usb1 irq 50: 0 xhci_hcd irq 18: 0 firewire_ohci irq 51: 0 xhci_hcd irq 23: 383342 ehci_hcd:usb2 irq 52: 0 xhci_hcd irq 40: 0 dmar0 irq 53: 387184 eth0 irq 42: 287131 ahci irq 54: 15 mei irq 43: 0 ahci irq 55: 528 snd_hda_intel irq 44: 0 xhci_hcd irq 56: 1499437 fglrx[0]@PCI:1:0: sda 158230r 110486w sdc 0r 0w sdb 0r 0w eth0 TX 26.99MiB RX 458.53MiB lo TX 595.99KiB RX 595.99KiB roger@roger-desktop:~$ -------------------------------------------------------- Nope - as in the famous movie line - "I'M BACK" sudo cat /proc/tty/driver/serial serinfo:1.0 driver revision: 0: uart:unknown port:000003F8 irq:4 1: uart:unknown port:000002F8 irq:3 2: uart:unknown port:000003E8 irq:4 3: uart:unknown port:000002E8 irq:3 4: uart:16550A port:0000D000 irq:17 tx:0 rx:0 CTS|DSR 5: uart:unknown port:00000000 irq:0 6: uart:unknown port:00000000 irq:0 ---------------------------------------------------------------- Is this disappearing act the chicken (cause of the problem), or the egg (result of the problem)?!? Or maybe it has no meaning in the case of the disappeared modem?