The Notebook Review forums were hosted by TechTarget, who shut down them down on January 31, 2022. This static read-only archive was pulled by NBR forum users between January 20 and January 31, 2022, in an effort to make sure that the valuable technical information that had been posted on the forums is preserved. For current discussions, many NBR forum users moved over to NotebookTalk.net after the shutdown.
Problems? See this thread at archive.org.

    what does this mean?

    Discussion in 'Linux Compatibility and Software' started by null84, Aug 1, 2007.

  1. null84

    null84 Notebook Evangelist

    Reputations:
    5
    Messages:
    368
    Likes Received:
    0
    Trophy Points:
    30
    my username "laptop kernel: [ 728.728000] Disabling IRQ #21"
     
    null84, Aug 1, 2007
    #1
  2. Pitabred

    Pitabred Linux geek con rat flail!

    Reputations:
    3,300
    Messages:
    7,115
    Likes Received:
    3
    Trophy Points:
    206
    Means that it's disabling IRQ number 21 ;)

    Your username is actually probably your computer name. Users aren't enabled at the IRQ detection stage of kernel booting. What it probably means is that some hardware requested IRQ 21 or something, and there was a bug in the driver.

    Go to a console and type "cat /proc/interrupts". The output should look something like this:
    Code: 
    david@dualie:~$ cat /proc/interrupts
           CPU0       CPU1
  0:  111038635          0   IO-APIC-edge      timer
  1:          2          0   IO-APIC-edge      i8042
  7:          0          0   IO-APIC-edge      parport0
  8:          3          0   IO-APIC-edge      rtc
  9:          1          0   IO-APIC-fasteoi   acpi
 12:          4          0   IO-APIC-edge      i8042
 14:    4882651          0   IO-APIC-edge      libata
 15:          0          0   IO-APIC-edge      libata
 16:     118509          0   IO-APIC-fasteoi   eth1
 17:          1          0   IO-APIC-fasteoi   EMU10K1, eth0
 18:   12522898          0   IO-APIC-fasteoi   uhci_hcd:usb1, nvidia
 19:      17445      53472   IO-APIC-fasteoi   uhci_hcd:usb2, aic79xx
 20:         15          0   IO-APIC-fasteoi   aic79xx
 21:          7          0   IO-APIC-fasteoi   ehci_hcd:usb3
NMI:          0          0
LOC:  111041963  111042000
ERR:          0
MIS:          0
david@dualie:~$
    Figure out what driver/device is using interrupt 21 (for example, my ehci_hcd, or USB2 controller, is using IRQ 21). If it's a USB controller like mine, it may be the USB device that's being detected at that point of boot-up or when you plug it in. If it's not USB, it may be that the hardware itself is failing, or that the driver is buggy, or a few other things in that vein.
     
    Pitabred, Aug 1, 2007
    #2
  3. null84

    null84 Notebook Evangelist

    Reputations:
    5
    Messages:
    368
    Likes Received:
    0
    Trophy Points:
    30
    oh thanks. i found it.
    21: 82675 17326 IO-APIC-fasteoi ehci_hcd:usb6

    hehe i was worry. i thought i got hacked or something. (still new at linux)
    thank you for answering
     
    null84, Aug 2, 2007
    #3
  4. Pitabred

    Pitabred Linux geek con rat flail!

    Reputations:
    3,300
    Messages:
    7,115
    Likes Received:
    3
    Trophy Points:
    206
    Yeah. That means that some USB device is horking up your USB controller. Possibly something like your fingerprint reader or webcam (which are often on internal USB connections any more).
     
    Pitabred, Aug 2, 2007
    #4