HD 6870 HDMI sound problem

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https://bbs.archlinux.org – Hi,I've followed the wiki https://wiki.archlinux.org/index.php/ATI to get HDMI to work with my archlinux computer, dedicated to run XBMC. At first, I used the integrated graphic card with my AMD 3870 processor and its HDMI output and everything was perfect.I had a spare HD 6870 so I thought I had to put it inside rather than letting it rot. Some xorg.conf change, and after the creation of /etc/asound.conf (I had to set the HD6870 as the primary HDMI output) I had both sound and image using HDMI on my HD 6870.I later could see some major problem, during some music or movie I lost video and (HowTos)