PCI=NOMSI , what is it and why we need to add it ?

Discussion in 'General Linux' started by OssNass, Oct 5, 2013.

  1. OssNass

    OssNass New Member

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    Hello
    I'm new to this forum and I've been thinking this is the best place to ask about this extra command to the Linux kernel's command line .
    My laptop is ASUS X61SL with Intel Core2Duo P8400 Processor and F50L motherboard.
    In order to boot I have to add pci=nomsi or acpi=off to the kernel's command line.
    I have a small idea about MSI, but I wish to learn more and more importantly I wish to learn why I have to add it .

    DevynCJohnson likes this.
  2. ryanvade

    ryanvade Administrator Staff Member Staff Writer

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    Well, acpi=off is basically turning off acpi. To learn about ACPI:
    http://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface
    I particularly like this line:
    Then, pci=nomsi just disables nomsi
    http://www.nvnews.net/vbulletin/showthread.php?t=120710
    http://en.wikipedia.org/wiki/Message_Signaled_Interrupts
    Is that what you are looking for?
  3. OssNass

    OssNass New Member

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    That answers the question of what but not the question of why.
    As I recall this problem started with Ubuntu 9 or 10
    Can I say that my laptop doesn't implement MSI in it's hardware ?!
    Seems kind of odd considering that my laptop is 5 years old
    DevynCJohnson likes this.

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