** Changed in: linux (Ubuntu Bionic)
       Status: In Progress => Fix Committed

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  amdgpu with mst WARNING on blanking

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Committed
Status in linux source package in Disco:
  Fix Released

Bug description:

  The amdgpu driver, when configured with MST monitors (i.e. displayport
  "daisy-chaining"), encounters a WARNING when blanking - such as when
  the display(s) are put to sleep after idle timeout.

  [test case]

  on a system with a amd gpu using the amdgpu driver, that is capable
  and configured for displayport mst (with multiple dp daisy chained
  monitors), blank the screen and then wake up the screen.  This will be

      [drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us * 3000 
tries - dce110_stream_encoder_dp_blank line:944
      ------------[ cut here ]------------
      WARNING: CPU: 0 PID: 2201 at 
 generic_reg_wait+0xe7/0x160 [amdgpu]
      Call Trace:
       dce110_stream_encoder_dp_blank+0x11c/0x180 [amdgpu]
       core_link_disable_stream+0x40/0x230 [amdgpu]
       ? generic_reg_update_ex+0xdb/0x130 [amdgpu]
       dce110_reset_hw_ctx_wrap+0xb7/0x1f0 [amdgpu]
       dce110_apply_ctx_to_hw+0x30/0x430 [amdgpu]
       ? dce110_apply_ctx_for_surface+0x206/0x260 [amdgpu]
       dc_commit_state+0x2ba/0x4d0 [amdgpu]
       amdgpu_dm_atomic_commit_tail+0x297/0xd70 [amdgpu]
       ? amdgpu_bo_pin_restricted+0x58/0x260 [amdgpu]
       ? wait_for_completion_timeout+0x1f/0x120
       ? wait_for_completion_interruptible+0x1c/0x160
       commit_tail+0x3d/0x60 [drm_kms_helper]
       drm_atomic_helper_commit+0xf6/0x100 [drm_kms_helper]
       drm_atomic_connector_commit_dpms+0xe5/0xf0 [drm]
       drm_mode_obj_set_property_ioctl+0x14f/0x250 [drm]
       drm_mode_connector_property_set_ioctl+0x2e/0x40 [drm]
       drm_ioctl+0x1e0/0x430 [drm]
       ? drm_mode_connector_set_obj_prop+0x70/0x70 [drm]
       ? ep_read_events_proc+0xb0/0xb0
       ? ep_scan_ready_list.constprop.18+0x1e6/0x1f0
       ? timerqueue_add+0x52/0x80
       amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
      ---[ end trace 3ed7b77a97d60f72 ]---

  [regression potential]

  this modifies the sequence of actions during link disabling, so any
  regressions would appear at that time.

  [other info]

  this is from upstream 8c9d90eebd23b6d40ddf4ce5df5ca2b932336a06

  this is included in disco from bug 1812427

  this is needed in bionic and cosmic

  the xenial kernel does not (reliably) support dp mst, so this is not
  needed there

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