However, the author of the ALSA CMI8788 driver, Clemens Ladisch, has rewritten this driver from scratch. This developer finally got his hands on an ASUS Xonar, which has led to this rewritten driver. Analog playback, digital playback, analog recording, and digital recording should be working to varying extents with this new driver. What is not yet implemented, however, is front panel output, mixer controls for analog recording, and SPDIF port controls.
More information on the C-Media CMI8788 Linux status can be found on this ALSA Wiki page. This driver is now called snd-oxygen or snd-virtuoso and we will be testing it here internally with the Razer Barracuda AC-1. For now the driver needs to be downloaded manually (the download link can be found in the above-mentioned Wiki page) but should appear in ALSA 1.0.16-rc1 and later.