I had some trouble (now solved) with the recent upgrade to 6.2. There was no sound from the DVI/HDMI output and video played back much too fast. Booting kernel-2.6.32-131.21.1.el6.x86_64 restored sound and video playback. The solution is to add 'radeon.audio=1' to the kernel arguments from grub and the new kernel also worked.
I'm using CentOS 6 on a media computer with the following graphics chip:
01:05.0 VGA compatible controller: ATI Technologies Inc RS880 [Radeon HD 4200] 01:05.1 Audio device: ATI Technologies Inc RS880 HDMI Audio [Radeon HD 4200 Series]
The Linux 3.0 kernel has the audio device disabled by default because some users were suffering from blank screens. These changes were then backported to the Radeon kernel driver for 6.2. Some searching revealed this as known issue, including Fedora bug 754825 and Ubuntu bug 897008.
I'm reporting this here because I didn't see it mentioned in either the upstream 6.2 release notes or the CentOS 6.2 release notes.
Finally, thanks to the CentOS team for another fine release.
Jim