https://bugs.freedesktop.org/show_bug.cgi?id=77677
--- Comment #25 from Andy Furniss adf.lists@gmail.com --- (In reply to comment #20)
I have tried disabling cpufreq on_demand and also forcing dpm auto/low/high, but there is no difference - I need load to make it work.
Been playing more - it seems to be CPU load that I need not GPU.
I can reproduce the issue playing audio without X started from fbcon.
make -j5 &>/dev/null on mesa from another fbcon will make the sound OK.
While I've got rid of cpufreq on_demand I haven't yet managed to stop acpi_cpufreq loading, though of course it may be innocent - no issues with the same setup with my 4890.