1891: Linux Kernel Parameters

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Last update: 03-10-2019

Additional parameters that can be applied prior to booting Linux kernel

This article applies to:


The following parameters can be used to load Linux kernel with specific options. When specifying multiple parameters, separate them with spaces.

  • acpi=off

    Disables ACPI which may help with a particular hardware configuration.

  • noapic

    Disables APIC (Advanced Programmable Interrupt Controller) which may help with a particular hardware configuration.

  • nousb

    Disables USB modules loading.

  • nousb2

    Disables USB 2.0 support. USB 1.1 devices still work with this option. This options allows to use some USB drives in USB 1.1 mode, if they do not work in USB 2.0 mode.

  • quiet

    This parameter is enabled by default and the startup messages are not displayed. Deleting it will result in the startup messages being displayed as the Linux kernel is loaded and the command shell being offered prior to running the very Acronis program.

  • nodma

    Disables DMA for all IDE disk drives. Prevents kernel from freezing on some hardware.

  • nofw

    Disables FireWire (IEEE1394) support.

  • nopcmcia

    Disables PCMCIA hardware detection.

  • nomouse

    Disables mouse support.

  • [module name]=off

    Disables the module (e.g. sata_sis=off).

  • pci=bios

    Forces to use PCI BIOS, not access the hardware device directly. For instance, if the machine has a non-standard PCI host bridge.

  • pci=nobios

    Disallows use of PCI BIOS, only direct hardware access methods are allowed. For instance, if you experience crashes upon boot-up, probably caused by the BIOS.

  • pci=biosirq

    Uses PCI BIOS calls to get the interrupt routing table. These calls are known to be buggy on several machines and they hang the machine when used, but on other computers it is the only way to get the interrupt routing table. Try this option, if the kernel is unable to allocate IRQs or discover secondary PCI buses on your motherboard.

More information

For general description and a complete list of kernel parameters see Kernel Parameters.