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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - R9 380X (Tonga) SMC failure with pcie_dpm_key_disabled=0"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=94973">94973</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>R9 380X (Tonga) SMC failure with pcie_dpm_key_disabled=0
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/AMDgpu
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>dri-devel@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>jay@jcornwall.me
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=123000" name="attach_123000" title="dmesg from drm-fixes-4.6">attachment 123000</a> <a href="attachment.cgi?id=123000&action=edit" title="dmesg from drm-fixes-4.6">[details]</a></span>
dmesg from drm-fixes-4.6

HW is R9 380X in primary PCIe 3 slot on ASUS P8B75-V with three monitors
attached (2x DVI and 1 HDMI).

First observed in 4.5 when Powerplay was enabled by default. Trace of SMC
messages around failure from drm-fixes-4.6 kernel:

[    9.666775] tonga_send_msg_to_smc(..., 0x145)
[    9.666799] tonga_send_msg_to_smc(..., 0x146)
[    9.666875] tonga_send_msg_to_smc(..., 0x5E)           
[    9.666895] tonga_send_msg_to_smc(..., 0x148)
[    9.667775] tonga_send_msg_to_smc(..., 0x145)
[    9.667800] tonga_send_msg_to_smc(..., 0x146)
[    9.774079] [drm] fb mappable at 0xE0BAA000
[    9.774083] [drm] vram apper at 0xE0000000
[    9.774085] [drm] size 9216000
[    9.774087] [drm] fb depth is 24
[    9.774089] [drm]    pitch is 7680
[    9.774213] fbcon: amdgpudrmfb (fb0) is primary device
[    9.774345] tonga_send_msg_to_smc(..., 0x5E)
[    9.943267] Failed to send Message.
[   10.112239] tonga_send_msg_to_smc(..., 0x145)

Other Powerplay functionality works correctly with pcie_dpm_key_disabled=1.</pre>
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