NV 185.19 causes sound distortion with HDA-INTEL
Ubuntu 8.10 or 9.04 kernels 2.6.27-14, 2.6.28-x, and 2.6.30-rc5 and rc6
Nvidia-185.19 (now no longer listed on the site, now says 185.18.10 is highest) causes sound distortion at the upper end of the volume settings. Setting volume down to 90% avoids the distortion.
Nvidia-180.51 does not have this distortion effect. 8.10 or 9.04, kernels 2.6.27-14 and 2.6.30-rc5 and rc6.
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
Note: I haven't included the usual mess of log files because those aren't different between the two versions.