I have installed with succeeding the version beta of Ubuntu hardy Heron, but after to have installed driver ati the 8,03 my audio system has gone in tilt. In short it comes emitted the classic bip of login manager but then more the nothing. Mine laptop it is equipped with: Intel Corporation 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller.
The error is this:

And: alsa-util.c: Device Error opening PCM hw: 0: Device or occupied resource
And: module.c: Failed to load module “module-alsa-sink” (argument: “device_id=0 sink_name=alsa_output.pci_8086_24d5_sound_card_0_alsa_playback_0 ″): initialization failed.

It seems that fglrx it installs a module or a plugin that goes in conflict with alsa occupying the device or the resource hw: 0 (my audio card). The problem afflicts to me from some day, and, if someone of it has experience, and wants to put it on hand, is absolutely the welcome.

It marks it near: