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Input devices, such as mice and keyboards, are displayed on several levels. Initial configuration is performed during installation where you select the mouse and keyboard types. You can change that configuration with your administration configuration tool, such as Red Hat Setup (see 30). Red Hat provides a keyboard configuration tool called kbdconfig and a mouse configuration tool called mouseconfig. Both can be run from any command line interface. Special configurations also exist for mice and keyboard for the X Window System, and for the KDE and Gnome desktops. You select the keyboard layout and language, as well as configure the speed and display of the mouse.
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Installing Sound, Network, and Other Cards
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For you to install a new card, your kernel must be configured to support it. Support for most cards is provided in the form of modules that can be dynamically loaded in and attached to the kernel, running as its extension. Installing support for a card is usually a simple matter of loading a module that includes the drives for it. For example, drivers for the Sound Blaster
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sound card are in the module sb.o. Loading this module makes your sound card accessible to Linux. Most distributions automatically detect the cards installed on your system and load the needed modules. If you change cards, you may have to load the module you need manually, removing an older conflicting one. For example, if you change your Ethernet card, you may have to unload the module for your previous card and load in the one for your new card. Certain utilities, such as Linuxconf and netcfg, enable you to choose a new Ethernet card and have the module loaded for you. You can, however, load modules manually. The later "Modules" section in this chapter describes this process. Device files for most cards are already set up for you in the /dev directory. For example, the device name for your sound card is /dev/audio. The device names for Network cards are aliases for network modules instead of device files. For example, the device name for your Ethernet card begins with eth, with the numbering starting from 0, as in eth0 for the first Ethernet card on your system. They will alias the module used for that particular card; for example, a 3com Etherlink XL card will alias the 3c59x network module, whose alias would be eth0 if it is the first Ethernet card.
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Multimedia Devices: Sound, Video, and DVD
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Currently, most Linux sound drivers are developed as part of the Open Sound System and freely distributed as OSS/Free. These are installed as part of Linux distributions. The OSS device drivers are intended to provide a uniform API for all Unix platforms, including Linux. They support Sound Blaster and Windows Sound System compatible sound cards (ISA and PCI). OSS is a commercial version called the Open Sound System (OSS). OSS is also available for a nominal fee and features configuration interfaces for device setup. A listing of the different OSS/Free sound devices is provided in Table 33-8. On Red Hat, you can use the sndconfig utility to install most sound cards on Linux. Some sound cards may require more specialized support (see Table 33-9). For sound cards, you can tell what your current sound configuration is by listing the contents of the /dev/sndstat file. You can test your card by simply redirecting a sound file to it, as shown here:
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cat sample.au > /dev/audio.
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Device /dev/sndstat /dev/audio /dev/dsp /dev/mixer /dev/music /dev/sequencer /dev/midi Driver Site
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Table 33-8: Sound Devices Description Sound driver status Audio output device Sound sampling device Control mixer on sound card High-level sequencer Low-level sequencer Direct MIDI port Table 33-9: Linux Sound Driver Sites Description Information and links to Linux Sound projects and site: www.xdt.com/ar/linux-snd The Advanced Linux Sound Architecture project (ALSA) is
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