I've recently change my PC OS from MS to Ubuntu.
Ubuntu 14.04 can correctly find my HDMI audio but with terrible echo and crackling sound.
I fix the echo issue by following the guide here: Sound problems in Ubuntu 14.04, and Static and crackling in my HDMI audio?. But the crackling sound still exist. I tried updating the video card driver directly from AMD website, didn't help either.
I also try to change the default sampling frequency in
/etc/pulse/daemon.conf to 44100 or 48000, both won't work.
I'm using video card MSI ATI R7 260x. How can I fix it, thanks!