Quake 3 engine games (Howto)

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This article describes how to get *Quake 3 engine games such as***Enemy Territory** to work with ALSA.

When I try to play Enemy Territory or other games based on the Quake 3 engine, I get an "/dev/dsp: Input/output error Could not mmap /dev/dsp" message

Read the OssEmulation documentation about setting the parameters for OSS via the /proc interface. For some people trying to play ET, the following works:

echo "et.x86 0 0 direct" > /proc/asound/card0/pcm0p/oss

which changes the playback part of OSS (indicated by the "p" in "pcm0p").

You will generally need to add write permissions even for the root user in order to echo anything to /proc/asound/card0/pcm0p/oss. Also remember your new settings will not be preserved following a reboot.

You may also need to try this:

echo "et.x86 0 0 disable" > /proc/asound/card0/pcm0c/oss 

which disables capture (meaning microphone input? PCM input?):

This is not enough for some driver modules such as cs46xx for which you need to enable mmap explicitly via a module option. See the relevant ALSA modules pages for more info on your driver modules.

On the M-Audio Revolution 7.1 with enemy-territory, all the above does is change the error message to: Could not set /dev/dsp to stereo=2.

An easy-fix workaround is using esd 0.2.35 or above as an intermediate, just type...

esddsp --mmap mygame

Where mygame is the name of the game, and it will probably run. You should have esd (esound) installed (and esd active) of course.

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Category: Howto

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