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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - PSR screen freeze"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=91436">91436</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>PSR screen freeze
          </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>normal
          </td>
        </tr>

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

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

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>ivan.mitev@gmail.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=117306" name="attach_117306" title="dmesg, booting undocked on bat, PSR=1, FBC=0">attachment 117306</a> <a href="attachment.cgi?id=117306&action=edit" title="dmesg, booting undocked on bat, PSR=1, FBC=0">[details]</a></span>
dmesg, booting undocked on bat, PSR=1, FBC=0

Enabling PSR -> screen freezes at boot a bit after modesetting, but not exactly
at modesetting since the resolution is changed to a high one and I can see
graphics.

Hardware: lenovo T450s, model 20BX000TBM (see attached dmidecode and lspci_vv).
OS: Fedora 22, fully updated (as of 2015-07-23)
Kernel: git drm-intel-nightly (as of 2015-07-22 evening). .config attached
(config.drm-intel).

Tests (attached dmesg -c > ...):

dmesg-boot_undocked_psr0_fbc1:
- boot with laptop undocked (but on AC), enable_psr=0, enable_psr=1
- laptop seems to work fine

dmesg-boot_undocked_psr1_fbc0:
- boot with laptop undocked (but on AC), enable_psr=1, enable_psr=0
- screen freezes at encrypted luks password (fedora's lock image shows up, with
the password field, but there's no screen feedback to keyboard events).
- laptop is responsive though, so I can blindly switch to a vt, log as root,
and dump dmesg to a file.

dmesg-0-boot_undocked_bat_psr1_fbc0:
- boot with laptop undocked (on battery), enable_psr=1, enable_psr=0
- same behavior as on AC (boot_undocked_psr1_fbc0).
dmesg-0-boot_undocked_bat_psr1_fbc0-after-suspend: I thought of another test:
blindly suspended laptop, resumed, and laptop's panel is now OK and laptop is
usable</pre>
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