https://bugs.freedesktop.org/show_bug.cgi?id=85107

--- Comment #12 from Alex Deucher agd5f@yahoo.com --- Created attachment 108260 --> https://bugs.freedesktop.org/attachment.cgi?id=108260&action=edit disable some dpm features

You might try this patch. If it helps try to narrow down which specific features are causing the problem. You might also check your bios configuration and see if any of those settings make a difference. All of the relevant power management code for your asic is in kv_dpm.c and kv_smc.c.