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This is a Cirrus Logic Audio controller

On the TP750 series, this chip is incorrectly called an MWave Audio Codec in marketing literature


  • Chipset: CS4248
  • Interface: ISA 16bit

Linux ALSA driver

This sound chip is supported by the snd-ad1848 kernel module. Use the following options line when loading this module:

options snd-ad1848 snd_index=0 snd_port=0x4e30 snd_irq=10 snd_dma1=0 snd_thinkpad=1

If you're running Debian Woody: Its ALSA 0.9 hasn't this Thinkpad support yet. Hence, you need to recompile the kernel (2.4.18) including the soundcore module and adding ALSA 1.0.

ThinkPads this chip may be found in