https://bugs.freedesktop.org/show_bug.cgi?id=110822

--- Comment #11 from Gobinda Joy <gobinda.joy@gmail.com> ---
Bisect
ad51c46eec739c18be24178a30b47801b10e0357 is the first bad commit
commit ad51c46eec739c18be24178a30b47801b10e0357
Author: Chengming Gui <Jack.Gui@amd.com>
Date:   Thu Mar 21 13:26:28 2019 +0800

    drm/amd/amdgpu: fix PCIe dpm feature issue (v3)

    use pcie_bandwidth_available to get real link state
    to update pcie table.

    v2: fix incorrect initialized return value
    v3: expand the fetching method about the link width to all asics.

    Signed-off-by: Chengming Gui <Jack.Gui@amd.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

:040000 040000 673bf23a6c2c2e461c6ff36e9bcca9d35c958881
605de484316e97aaa83273d5a08340e873ff851e M      drivers

This is the merge with that and other commits introducing the bug
ea2cec24c8d429ee6f99040e4eb6c7ad627fe777
 Merge tag 'drm-fixes-2019-04-05' of git://anongit.freedesktop.org/drm…

…/drm

Pull drm fixes from Dave Airlie:
 "Pretty quiet week, just some amdgpu and i915 fixes.

  i915:
   - deadlock fix
   - gvt fixes

  amdgpu:
   - PCIE dpm feature fix
   - Powerplay fixes"

* tag 'drm-fixes-2019-04-05' of git://anongit.freedesktop.org/drm/drm:
  drm/i915/gvt: Fix kerneldoc typo for intel_vgpu_emulate_hotplug
  drm/i915/gvt: Correct the calculation of plane size
  drm/amdgpu: remove unnecessary rlc reset function on gfx9
  drm/i915: Always backoff after a drm_modeset_lock() deadlock
  drm/i915/gvt: do not let pin count of shadow mm go negative
  drm/i915/gvt: do not deliver a workload if its creation fails
  drm/amd/display: VBIOS can't be light up HDMI when restart system
  drm/amd/powerplay: fix possible hang with 3+ 4K monitors
  drm/amd/powerplay: correct data type to avoid overflow
  drm/amd/powerplay: add ECC feature bit
  drm/amd/amdgpu: fix PCIe dpm feature issue (v3)

Hope it helps.

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