In Qtopia Phone Edition 2.2.0 is ALSA supported in Qtopia and what drivers are required for playing sounds / music?

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Answer:

Yes, but Qtopia is designed to use the OSS interface for sound which means that in addition to using an OSS driver your platform must have OSS compatibility. Qtopia does not use any of the ALSA interfaces for audio. Alternatively (to using an OSS driver) you may try using a compatibility library for ALSA to OSS. We recommend you look at: http://www.fr.linuxfromscratch.org/view/blfs-1.0/multimedia/alsa-oss.html

Trolltech plans to support ALSA in future versions of Qtopia, but at this point we cannot give you a timeframe for this development.