28.5. Enhancing Hardware Support

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By default, Red Hat Enterprise Linux attempts to automatically detect and configure support for all of the components of your computer. Red Hat Enterprise Linux supports the majority of hardware in common use with the software drivers that are included with the operating system. To support other devices you may supply additional drivers during the installation process, or at a later time.

28.5.1. Overriding Automatic Hardware Detection

For some models of device automatic hardware configuration may fail, or cause instability. In these cases, you may need to disable automatic configuration for that type of device, and take additional steps to manually configure the device after the installation process is complete.


Refer to the Release Notes for information on known issues with specific devices.
To override the automatic hardware detection, use one or more of the following options:
Table 28.3. Hardware Options
Compatibility Option
Disable all hardware detection noprobe
Disable graphics, keyboard, and mouse detection headless
Disable passing keyboard and mouse information to stage 2 of the installation program nopass
Use basic VESA driver for video xdriver=vesa
Disable shell access on virtual console 2 during installation noshell
Disable advanced configuration and power interface (ACPI) acpi=off
Disable machine check exception (MCE) CPU self-diagnosis. nomce
Disable non-uniform memory access on the AMD64 architecture numa-off
Force kernel to detect a specific amount of memory, where xxx is a value in megabytes mem=xxxm
Enable DMA only for IDE and SATA drives libata.dma=1
Disable BIOS-assisted RAID nodmraid
Disable Firewire device detection nofirewire
Disable parallel port detection noparport
Disable PC Card (PCMCIA) device detection nopcmcia
Disable all probing of network hardware nonet


The isa option causes the system to display an additional text screen at the beginning of the installation process. Use this screen to configure the ISA devices on your computer.


Other kernel boot options have no particular meaning for anaconda and do not affect the installation process. However, if you use these options to boot the installation system, anaconda will preserve them in the bootloader configuration.
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