Performance is more than halved in games (used Talos Principle on RADV for bisection) due to the mclk being stuck at 167 MHz. commit 42a2d4839bc4f095621d259a3ff5401063b914cc (HEAD, refs/bisect/bad) Author: Evan Quan <evan.quan@amd.com> Date: Fri Jan 25 14:09:40 2019 +0800 drm/amd/powerplay: support Vega10 SOCclk and DCEFclk dpm level settings Enable SOCclk and DCEFclk dpm level retrieving and setting on Vega10. Change-Id: Iab35a6cc85cdfcf48f06f7d20b95a52c6feb60d1 Signed-off-by: Evan Quan <evan.quan@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Kernel cmdline has amdgpu.exp_hw_support=1 log_buf_len=1 amdgpu.sched_hw_submission=64 amdgpu.gpu_recovery=1 amdgpu.cik_support=1 radeon.cik_support=0 amdgpu.cg_mask=0 amdgpu.pg_mask=0 idle=nomwait and nothing interesting showing up in dmesg. I can't CC Evan Quan due to lack of bugzilla account.
Should be fixed with this patch: https://patchwork.freedesktop.org/patch/282836/
Can confirm it fixes the issue for me.
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