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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Kernel Hung when starting X while detecting outputs"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=96278">96278</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Kernel Hung when starting X while detecting outputs
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>XOrg git
          </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>major
          </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>frederik.schwan@linux.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=124177" name="attach_124177" title="bad dmesg">attachment 124177</a> <a href="attachment.cgi?id=124177&action=edit" title="bad dmesg">[details]</a></span>
bad dmesg

Hardware: Dell Precision Laptop 7710 with Intel HD P530 and AMD FirePro W7170M
(Amethyst XT)

Kernel: 4.6 and 4.7rc1
xf86-video-amdgpu: 1.1.0

Description:
When X is started, it accepts no connections ("waiting for X server to accept
connections") forever. 
There is another bugreport over here [1] that has the same problem with the
radeon driver. Dmesg is attached.


The stacktrace seems to be nearly the same:

schedule
rpm_resume
wake_atomic_t_function
__pm_runtime_resume
[amdgpu_connector_dp_detect/radeon_dvi_detect] (output detection)
drm_helper_hpd_irq_event
[amdgpu/radeon]_resume_kms
[amdgpu/radeon]_pmops_runtime_resume
pci_pm_runtime_resume
vga_switcheroo_set_dynamic_switch
vga_switcheroo_runtime_resume
...
...
...

[1]
<a href="http://unix.stackexchange.com/questions/269223/lightdm-fails-to-load-after-system-upgrade-in-arch-x64">http://unix.stackexchange.com/questions/269223/lightdm-fails-to-load-after-system-upgrade-in-arch-x64</a></pre>
        </div>
      </p>


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